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Altair SimSolid Technology Overview Altair SimSolid Technology Overview Learn More
Altair SimSolid Technology Overview
An overview of the theoretical foundation of SimSolid, including mathematical background, computer implementation, and positioning among numerical methods.

Magnet Weight Minimization of PMM over Multiple Operating Points Magnet Weight Minimization of PMM over Multiple Operating Points Learn More
Magnet Weight Minimization of PMM over Multiple Operating Points
Magnet Weight Minimization of Electric Traction Interior Permanent Magnet Motor Over Multiple Operating Points

This paper describes the process of using Altair tools such as Flux for synchronous permanent magnet motor EM FEA analysis and HyperStudy to minimize the weight of the NdFeB magnets of a typical IPM motor for electric traction application such as the IPM motor of the Toyota Prius 2010.

Simulation-Driven Design: Solving the Geometry Problem Simulation-Driven Design: Solving the Geometry Problem Learn More
Simulation-Driven Design: Solving the Geometry Problem
One of the challenges of simulation is that geometry of CAD and traditional FEA are different, necessitating time consuming simplification work to define the mesh and resulting in losses in accuracy.

Altair SimSolid takes a different approach, analyzing fully featured CAD assemblies directly with no absolutely no mesh.

How Can 3D-Printed Plastic Waveguides Enable V-Band Applications? How Can 3D-Printed Plastic Waveguides Enable V-Band Applications? Learn More
How Can 3D-Printed Plastic Waveguides Enable V-Band Applications?
Using Altair Feko, ALCIOM examined two prototypes manufactured using 3D-printing technology to demonstrate the performance of 3D-printed plastic waveguide components at V-band frequencies.

Article originally appeared in Microwaves&RF (www.mwrf.com) on January 4, 2019

Ultra-Fast High-Fidelity Computational Fluid Dynamics on GPUs for Automotive Aerodynamics Ultra-Fast High-Fidelity Computational Fluid Dynamics on GPUs for Automotive Aerodynamics Learn More
Ultra-Fast High-Fidelity Computational Fluid Dynamics on GPUs for Automotive Aerodynamics
In this white paper, we present the innovative commercial GPU-based Computational Fluid Dynamics (CFD) solver Altair ultraFluidX. This work features simulations of the DrivAer model, a generic, publicly available vehicle geometry that was developed by the Chair of Aerodynamics and Fluid Mechanics at the Technical University of Munich and which is widely used for testing and validation purposes.

The DrivAer model features rear end, underbody designs, and underhood flow. This model was then used to perform both wind tunnel tests and numerical simulations of the 40% scale open cooling geometry using perforated aluminum sheets with different opening ratios to mimic different radiator properties. Within, we will compare some of the results from these wind tunnel tests with numerical results obtained with Altair ultraFluidX.

Non-Linear Optimization of Suspension Link for Optimal Performance using Altair’s OptiStruct and HyperWorks Non-Linear Optimization of Suspension Link for Optimal Performance using Altair’s OptiStruct and HyperWorks Learn More
Non-Linear Optimization of Suspension Link for Optimal Performance using Altair’s OptiStruct and HyperWorks
In recent times there is a high demand for lightweight automotive components which will reduce oil consumption and emissions. The components that are under non-linear load conditions would need optimization techniques that would yield a design which satisfies all performance targets and at the same time maintains the process efficiency with respect to time and cost. The use of CAE tools such as Altair’s OptiStruct and HyperWorks allows engineers to explore various design solutions starting from concept level to matured design that meets multiple requirements simultaneously with due consideration of manufacturing methods that allows engineers to arrive at an optimal design and process.

Testing Aerial Ladders in FEA: Wind Load Standard Equation vs CFD Wind Tunnel Analysis Testing Aerial Ladders in FEA: Wind Load Standard Equation vs CFD Wind Tunnel Analysis Learn More
Testing Aerial Ladders in FEA: Wind Load Standard Equation vs CFD Wind Tunnel Analysis
To design and build an aerial ladder for a firetruck, the engineer needs to accurately
determine the working loads the ladder will encounter. Some of these can be easy to
interpret such as the weight of the firefighter in the basket at the end of the ladder, or
the weight of the water being supplied to the nozzle. Other loads can be a little harder
to quantify, such as how wind affects the ladder. There are several different ways to
determine this effect, and two of those will be explored in this paper: the standard
equation (ASCE 7-10), and CFD.

Fully Polarimetric Analysis of Wireless Connectivity for Smart Home and IoT Applications Fully Polarimetric Analysis of Wireless Connectivity for Smart Home and IoT Applications Learn More
Fully Polarimetric Analysis of Wireless Connectivity for Smart Home and IoT Applications
This white paper presents a study of wireless connectivity of electronic devices in the Wi-Fi band. For accuracy, the analysis will use the full polarimetric information for each device’s antenna pattern. The study focuses on wireless connectivity between lamps and light switches in an indoor environment, with the goal to set guidelines for spacing between transmitters and receivers: wall-mounted switch boxes and ceiling-mounted lamps, as well as pairs of lamps. In general, the work flow would be similar for any type of wireless connectivity in environments such as a smart home, an industrial site, as well as streets and intersections (vehicle-to-vehicle or vehicle-to-infrastructure communication).

Multiphysics Design Optimization Using an Adjoint Sensitivity Analysis Multiphysics Design Optimization Using an Adjoint Sensitivity Analysis Learn More
Multiphysics Design Optimization Using an Adjoint Sensitivity Analysis
Optimal design methods involving the coupling of fluid and structural solutions are a topic
of active research; particularly for aerospace applications. The paper presents a coupled fluid and structure approach to topology optimization using two commercial finite element solutions; AcuSolve and OptiStruct. A gradient based method is used to minimize the compliance of a structure subject to thermal loading. The optimal material distribution to minimize compliance is computed using the Solid-Isotropic Material with Penalty (SIMP) method available in OptiStruct. A volume fraction constraint is imposed in order to iteratively reduce the parts mass. Draw constraints are used to ensure manufacturability. The thermal loading is computed iteratively using a computational fluid dynamics (CFD) solution from AcuSolve. The optimization produces an innovative design which increases the heat rejection rate of the part while reducing the mass.

Seat Design for Crash in the Cloud Seat Design for Crash in the Cloud Learn More
Seat Design for Crash in the Cloud
The benefit of design exploration and optimization is understood and accepted by engineers but the required intensive computational resources have been a challenge for their adoption into the design process. The HyperWorks Unlimited (HWUL) appliance provides an effective solution to these challenges as it seamlessly connects all the necessary tools together in the cloud. The aim of this study is to showcase the benefits of HWUL on an optimization driven design of a
complex system. For this purpose an automotive seat design for crash loadcases is selected.

Magnet Weight Minimization of Electric Traction Interior Permanent Magnet Motor Over Multiple Operating Points Magnet Weight Minimization of Electric Traction Interior Permanent Magnet Motor Over Multiple Operating Points Learn More
Magnet Weight Minimization of Electric Traction Interior Permanent Magnet Motor Over Multiple Operating Points
This paper describes the process of using Altair tools such as Flux for synchronous permanent magnet motor EM FEA analysis and HyperStudy to minimize the weight of the NdFeB magnets of a typical IPM motor for electric traction application such as the IPM motor of the Toyota Prius 2010.

Fast contact method for speeding up solving finite element problems involving non-linear contact behavior Fast contact method for speeding up solving finite element problems involving non-linear contact behavior Learn More
Fast contact method for speeding up solving finite element problems involving non-linear contact behavior
For large aerospace assemblies in finite element (FE) analysis problems, contact interaction between the surrounding bodies has to be established to simulate the load transferred between the components, like aircraft engine carrying bracket assemblies, spigots assemblies etc., and understand the effects of interaction between respective parts. In some cases, depending upon geometry of the assembly, the region of study may not be contact area but the stresses acting within the parts themselves. If there is no geometric or material non-linearity in such problems, a new contact formulation method known as Fast Contact can be used in these contact regions.

Antenna Placement Optimization for Vehicle-To-Vehicle Communications Antenna Placement Optimization for Vehicle-To-Vehicle Communications Learn More
Antenna Placement Optimization for Vehicle-To-Vehicle Communications
Vehicle-to-vehicle (V2V) technology has the potential to significantly enhance driver safety. The type, placement, and orientation of V2V antennas all affect the performance of the communication system. Simulation software for high frequency electromagnetics can be used to analyze the farfield effects of various vehicle antenna configurations without the need to perform physical testing. We present a simulation-based method for optimizing the placement and orientation of a monopole antenna on a vehicle using a Global Response Surface Method (GRSM).

MIMO System Simulation in WinProp MIMO System Simulation in WinProp Learn More
MIMO System Simulation in WinProp
This white paper presents and discusses practical examples of communication simulations involving Multiple Input Multiple Output (MIMO) technology. Two workflows exist for MIMO simulations in WinProp; this note discusses the workflows, and presents an example with relevant results for each.

Topology Optimization and Casting Feasibility of a Robot Arm Topology Optimization and Casting Feasibility of a Robot Arm Learn More
Topology Optimization and Casting Feasibility of a Robot Arm
Oftentimes, in the design of a casting, suboptimal structural concepts are developed which at the same time are not castable, requiring multiple and time-consuming design iterations. This paper describes a process to generate both structurally efficient and also castable parts, while reducing the overall design cycle time. The optimal structure is determined by topology optimization, reducing component mass while maintaining performance requirements. This step is followed by a design smoothing operation and then by a casting simulation to check for casting defects. To demonstrate this software driven product design and process validation, solidThinking Inspire® is used to develop the concept design and Click2Cast® for casting process validation.

Design Optimization for Additive Manufacturing in OptiStruct with consideration of Overhang Angle in Topology Optimization Design Optimization for Additive Manufacturing in OptiStruct with consideration of Overhang Angle in Topology Optimization Learn More
Design Optimization for Additive Manufacturing in OptiStruct with consideration of Overhang Angle in Topology Optimization
This paper gives a technical review and guidelines for positioning the current capabilities. Note that the following uses OptiStruct version v2018. There have been some changes to the discussed algorithms compared to previous versions. Generally, version 2017.2.3 can be used to reproduce all the presented results.

Snap-Fit Optimization for Achieving Desired Insertion and Retention Forces Snap-Fit Optimization for Achieving Desired Insertion and Retention Forces Learn More
Snap-Fit Optimization for Achieving Desired Insertion and Retention Forces
Snap-fits are ubiquitous engineering features used to quickly and inexpensively assemble plastic parts. The geometric, material, and contact nonlinearities associated with snap-fit problems can present modeling challenges. Quasi-static solutions with explicit solvers are commonly used to analyze snapfits; however, OptiStruct’s nonlinear solver now possess the ability to solve these highly nonlinear problems implicitly. The first part of this study discusses an effective approach to using OptiStruct for the implicit finite element analysis of snap-fits. Once an accurate simulation model has been created, engineers typically make design changes in order to achieve desired insertion and retention forces. The second part of this study details how HyperMesh morphing and HyperStudy can be used to optimize the snap-fit design, resulting in desired insertion and retention forces while minimizing mass and ensuring structural integrity. The approach documented in this report can reduce the design time, material use, and failure rate of snap-fits used in industry.

MDO Director Datasheet MDO Director Datasheet Learn More
MDO Director Datasheet
A multi-disciplinary optimization (MDO) approach allows you to explore all design requirements simultaneously and achieve lighter products, faster. Until now, enabling this process on live vehicle programs has been a challenge. Altair's MDO Director is a novel set of software tools that provides a process to rapidly set up, execute, post-process and explore the design of MDO problems.

FEKO Lua Script: ISAR Image Processing FEKO Lua Script: ISAR Image Processing Learn More
FEKO Lua Script: ISAR Image Processing
The script computes and displays an inverse synthetic aperture radar (ISAR) image from backscattered radar cross section (RCS) data over frequency and angle. Windowing functions, resampling and extracting the local maxima positions to file are supported. The script requires a far field RCS request or far field RCS data imported from a file containing far field data (a .ffe file). Data imported from a .ffe file must be added manually to a 3D view.

Multi-physics Electric Motor Optimization for Noise Reduction Multi-physics Electric Motor Optimization for Noise Reduction Learn More
Multi-physics Electric Motor Optimization for Noise Reduction
In an electric machine, the torque is generated by electromagnetic forces which also create some parasitic vibrations of the stator. These vibrations excite the mechanical structure on which the motor is fixed and generate sound. When designing the electric machine, this aspect has to be taken into account from the start since it depends on the harmonic content of the currents that feed the machine, on the shapes of the rotor and stator, and on the interaction of the electric frequencies with the natural mechanical modes of the structure.
To simulate this phenomenon, a coupling between electromagnetic calculations and vibration analysis has to be set-up. Some optimization procedure can also be added in order to reduce the noise.
In what follows, it is shown how Altair HyperWorks suite; specifically FluxTM, OptiStruct®, HyperMesh® and HyperStudy® products have been successfully used to perform a multi-physics optimization for noise reduction in a fuel pump permanent magnet motor.

Weld Certification Director Datasheet Weld Certification Director Datasheet Learn More
Weld Certification Director Datasheet
Altair's Weld Certification Director (WCD) is a combination of a base software with customer specific additions and integrated services that allows engineers to accelerate the time taken to identify and analyze the performance of weld lines against mechanical requirements.

Model Mesher Director Datasheet Model Mesher Director Datasheet Learn More
Model Mesher Director Datasheet
Altair's Model Mesher Director (MMD) is a fully integrated, user-friendly solution that empowers engineers to import & modify geometry and mesh models with specific mesh criteria automatically with the power of Altair HyperWorks tools. Company’s face the challenge of analyzing ever larger and more complex models.

Model Verification Director Datasheet Model Verification Director Datasheet Learn More
Model Verification Director Datasheet
Altair's Model Verification Director (MVD) allows engineering analysts to validate CAD model data received from the design teams, automatically identifying potential issues that could slow down the pre-processing stage of the simulation life cycle. The MVD is embedded into HyperWorks pre-processing technology, HyperMesh and integrated into the Assembly Browser.

NVH Director Datasheet NVH Director Datasheet Learn More
NVH Director Datasheet
Automotive Noise and Vibration Analysis involves some of the largest and most complex models being used for Finite Element Analysis. Models regularly involve millions of finite elements, with thousands of components and properties, along with the connections between those components.

Virtual Gauge Director Datasheet Virtual Gauge Director Datasheet Learn More
Virtual Gauge Director Datasheet
Correlation between CAE and tests results is very strategic activity. It boosts the confidence in the development of the product. Altair’s Virtual Gauge Director (VGD) is a combination of customized software and services that enable engineers to extract the results at the exact position of the strain gauge as in the test lab, interpolate the results at an identified CAE location, compute results in the local coordinate system of the gauge, and give a correlation index confidence. The Director can also be used to interpolate stress or strain values at any placement in the model.

Weight Analytics Datasheet Weight Analytics Datasheet Learn More
Weight Analytics Datasheet
Altair's Weight Analytics (WA) solution manages the entire Weight and Balance (W&B) process empowering engineering and management teams to control and ensure W&B attributes meet program requirements. Deployed as a common weight management tool across the enterprise, WA enables faster and more accurate decision-making with on-demand access to visualize, analyze and predict W&B at any point in time during the entire Product Lifecycle (PLC).

Geomechanics Director Datasheet Geomechanics Director Datasheet Learn More
Geomechanics Director Datasheet
Altair's Geomechanics Director (GeoD) allows engineers and scientists, especially in the Rock Mechanics and Geology groups at Oil and Gas companies, to build finite element models from subsurface geology quickly and efficiently.

Impact Simulation Director Datasheet Impact Simulation Director Datasheet Learn More
Impact Simulation Director Datasheet
Altair's Impact Simulation Director (ISD) solutions empower engineers and designers to simulate the impact performance of designs faster to cost-effectively produce higher-quality products. ISD solutions automate the laborious, manual tasks associated with model setup, analysis, post-processing and reporting.Highly tailored to an organization's specific procedures and best practices, Altair's ISD solutions reduce development time and costs while enhancing product robustness and performance.

Automated Reporting Director Datasheet Automated Reporting Director Datasheet Learn More
Automated Reporting Director Datasheet
Altair's Automated Reporting Director (ARD) empowers engineers by removing the non-value add tasks associated with the mechanics of report generation. Engineers can focus entirely on interpreting and understanding simulation results as opposed to manually creating required reports.

OptiStruct for Structural Analysis: Not Just for Optimizations Anymore OptiStruct for Structural Analysis: Not Just for Optimizations Anymore Learn More
OptiStruct for Structural Analysis: Not Just for Optimizations Anymore
Reprint of Engineering.com article on OptiStruct as a structural analysis tool with built-in optimization capabilities

Analysis of Grounding Performances of a Car Body Using FEM Shell Elements Analysis of Grounding Performances of a Car Body Using FEM Shell Elements Learn More
Analysis of Grounding Performances of a Car Body Using FEM Shell Elements
In the automotive domain, the EMC phenomenon of the current return occurs over a wide frequency band due to the fact that the paths followed by the current are very different between the lowest frequencies (a few Hz) and medium frequencies(hundreds of kHz).

Checking Remanence Issues with New Hysteresis Model Checking Remanence Issues with New Hysteresis Model Learn More
Checking Remanence Issues with New Hysteresis Model
Remanence is what is left when all current is removed, and there is still some flux density left in the iron core. This is often the case with a close path for flux density, especially in U or E shape devices. To get rid of this effect, it is sometimes useful to add a so-called remanent airgap. This paper explains what we have incorporated into Flux to model this effect due to hysteresis.

Cogging Torque Computation and Mesh for Non-radial Electrical Motors in Flux® Cogging Torque Computation and Mesh for Non-radial Electrical Motors in Flux® Learn More
Cogging Torque Computation and Mesh for Non-radial Electrical Motors in Flux®
All electrical motor designers know that the computation of cogging torque is a tricky task, particularly in 3D. Indeed, the amplitude of this variable is almost the same as numerical noise. In most cases, conventional mesh methodology is not sufficient and specific methodology must be used. At CEDRAT, thanks to its experience, the application team has developed methodologies to successfully compute
cogging torque in most cases. This article presents a specific mesh methodology to compute cogging torque for 3D non-radial electrical motors.


Cogging Torque Computation and Meshing for Radial Electrical Motors in Flux® Cogging Torque Computation and Meshing for Radial Electrical Motors in Flux® Learn More
Cogging Torque Computation and Meshing for Radial Electrical Motors in Flux®
All electrical motor designers know that the computation of cogging torque is a tricky task in 3D. Indeed, the amplitude of this quantity is almost the same as the numerical noise. In most cases, a classical meshing methodology is not sufficient and specific methodology must be used. At CEDRAT, the application team, thanks to its experience has developed methodologies to successfully compute cogging torque in most of cases. This article presents a specific meshing methodology to compute cogging torque for 2D and 3D radial electrical machine. It begins with some general recommendation concerning the definition of the geometry in order to facilitate the meshing operation. Then, it presents the specific meshing methodology applied to a 2D SPM motor and to a 3D IPM motor.

Comparative Study of Concentrated and Distributed Winding Using Flux® Comparative Study of Concentrated and Distributed Winding Using Flux® Learn More
Comparative Study of Concentrated and Distributed Winding Using Flux®
The paper presents a comparative study of 3-phase permanent-magnet (PM) synchronous machines (PMSM) with concentrated and distributed windings. The purpose of this study is to identify the machine that gives the better electromagnetic performance (torque, efficiency, back electromotive force…). Two PMSM with concentrated and distributed windings having identical output power, stator and rotor outer diameter, airgap, axial length, are designed. Machine performance of the two machines is compared using finite element analysis (Flux 2D).

Eccentricities Faults in a Rotating Machine Analyzed with Flux® Eccentricities Faults in a Rotating Machine Analyzed with Flux® Learn More
Eccentricities Faults in a Rotating Machine Analyzed with Flux®
In the present energy efficiency context of electrical machines, diagnosis of rotating machines is increasingly studied. Designers seek to include the on-line, non-invasive diagnosis and typical signatures of the rotating machines faults in the stator winding currents, torque, leakage magnetic field…etc. Among the rotating machine’s faults, 7 to 10% are located in the rotor and some of these faults are eccentricities. These faults generate electromagnetic torque oscillations: electromagnetic forces acting on the stator, particularly the stator winding, which can accelerate wear of its insulation. Friction between the stator and the rotor is not excluded; this can also have an adverse effect on the bearing.
In the literature we often find three types of eccentricities: static, dynamic and mixed. Our Flux 2D/3D/Skew finite element solution can be of considerable help to predict the typical signatures of eccentricities faults and the influence of these defects on the electromagnetic and vibro-acoustic
performances of these machines, a very differentiating feature of the software. The purpose of this article is to show the feasibility of the different eccentricities with Flux 2D/3D/Skew thanks to the
possibilities offered by mechanical sets.


Eccentricities Faults Magnetic Signature of an Induction Machine Determined with Flux® Eccentricities Faults Magnetic Signature of an Induction Machine Determined with Flux® Learn More
Eccentricities Faults Magnetic Signature of an Induction Machine Determined with Flux®
In the literature we can find two approaches to make diagnosis: Model approach - a specific method for automation engineers. Depending on the mechanism adopted, we can distinguish three branches in this method: monitoring by observers, by analytical redundancy and by parametric estimation. Signal approach - this approach is based on measurable signals data, such as current, torque, stray flux, noise and vibration, temperature. The principle of this method is to look for frequencies unique to the healthy or fault operation. Faults in electrical
rotating machines can induce other phenomena such as noise and vibrations and possibly other faults like friction between the stator and the rotor or accelerated wear of insulations.


FE Steady State Thermal Analysis of Squirrel Cage Induction Motors with Flux® FE Steady State Thermal Analysis of Squirrel Cage Induction Motors with Flux® Learn More
FE Steady State Thermal Analysis of Squirrel Cage Induction Motors with Flux®
The thermal analysis of electrical machines and the related fluid dynamic computation, tasks associated with mechanical engineering disciplines, seem to interest electrical engineers less than electromagnetic analysis. But, with increasing requirements to fully exploit new designs and materials, it has more or less become compulsory to analyze the thermal behavior of electrical machines, to the same degree as electromagnetic design.

Finite Elements Method Modeling of Contactless Energy Transfer Systems Finite Elements Method Modeling of Contactless Energy Transfer Systems Learn More
Finite Elements Method Modeling of Contactless Energy Transfer Systems
Contactless energy transfer (CET) systems are used in many industrial sectors. These include conveyors, trolleys, storage and retrieval units, baggage handling, battery charging stations, mobile phones and medical implants. The energy transfer model is quite similar to a conventional transformer, except for the weak coupling between the primary and secondary windings and partial or non-existent ferromagnetic closing paths. Inductive coupling is commonly used in a range from a few mW to a few hundred kW.



How to Efficiently Design Power Transformers How to Efficiently Design Power Transformers Learn More
How to Efficiently Design Power Transformers
Nowadays Power Transformers need to optimize their efficiency to make sure a minimum amount of losses are generated from the various physical phenomena. Flux Finite Element studies allow transformer designers to accurately analyze the different losses (Joule losses, iron losses, stray losses) to enhance the performance of their transformers. A few steady-state and transient tests permit determining the electrical and mechanical constraints that the power transformer will have to endure in its life. In addition, thermal studies can complete these analyses to detect and prevent hot spots on the tank or in the windings.

Induction Heating and Forced Cooling Analysis with Flux® Induction Heating and Forced Cooling Analysis with Flux® Learn More
Induction Heating and Forced Cooling Analysis with Flux®
Principle of induction heating and forced cooling (shower): induction heating is the process of heating an electrically conducting object without contact. The flowing of the current through the coil (see Fig.1) generates an alternating magnetic field. This field induces current in the electric conductor (eddy current). The repartition of eddy current depends on the shape of the electric conductor, the frequency, and physical properties of the material used in the electric
conductor. In addition to this, the high frequency used in induction heating applications gives rise to a phenomenon called skin effect: all the current is concentrated only on the boundaries.


Regulate Current with User Subroutine Using Groovy Language in Flux® Regulate Current with User Subroutine Using Groovy Language in Flux® Learn More
Regulate Current with User Subroutine Using Groovy Language in Flux®
For Switched Reluctance Motor, a specific command of current is often used with a chopper in order to decrease the current
ripple or hysteresis band. We propose to see in this example (see Figure 1) how to implement such a command in Flux using
groovy language.

Study of Mounted Surface Permanent Magnet Synchronous Machine Using Flux® Skew Study of Mounted Surface Permanent Magnet Synchronous Machine Using Flux® Skew Learn More
Study of Mounted Surface Permanent Magnet Synchronous Machine Using Flux® Skew
Requirements: rotating electrical machine designers want high-reliability, minimum power losses, maximum power, maximum torque and low mechanical resonance vibration and noise. To meet the needs of electrical machine designers, CEDRAT started developing tools that take Skew into account in 2003. Several improvements have been made to this tool. Skew is usually accounted for by sub-dividing the active length of the machine into several 2D slices. In the latest Skew version of Flux the post processing is directly a full 3D post-processing.

Taking Demagnetization into Account in Permanent Magnets Using Flux® Taking Demagnetization into Account in Permanent Magnets Using Flux® Learn More
Taking Demagnetization into Account in Permanent Magnets Using Flux®
Materials can be classified according to their magnetic property into two main categories:
Soft magnetic materials: which exhibit magnetic properties with the presence of external excitation. Hard magnetic materials: exhibit magnetic properties in the absence of magnetic excitation. Permanent magnets are part of this family.


Tunnel Magnetoresistance (TMR) Angle Sensor Simulation Results Tunnel Magnetoresistance (TMR) Angle Sensor Simulation Results Learn More
Tunnel Magnetoresistance (TMR) Angle Sensor Simulation Results
The article presents the main results of magnetostatic 3D simulation using CEDRAT Flux software especially for new TMR angle sensor applications. Such magnetic sensors are deployed today in automotive electronics, as well as in many new industrial, consumer-product, medical, avionics, defence and other applications. Under Flux 3D, several effects of the influence of magnet geometry parameters and mechanical tolerances of sensor positioning were investigated, such as airgaps and tilts effects. The results include optimum solutions useful for TMR, as well as for a wide range of other angle sensor types and applications.

Using CEDRAT’s Tool to Review Thermal Solutions Using CEDRAT’s Tool to Review Thermal Solutions Learn More
Using CEDRAT’s Tool to Review Thermal Solutions
Nowadays, it is more and more difficult to design electrotechnique devices without considering thermal stress. In more and more applications (electric vehicles, electric aircraft, etc.) there is a need to reduce weight and cost, increase efficiency, whilst maintaining security. One possibility is to increase current for the same device, and therefore how to draw away the heat. This is why conventional approximations
need to be cross-checked with new tools. These new tools have to be quick and precise in order to run parametric and even optimisation analyses. Of course, thermal analysis is already available in the Flux suite for induction heating, induction hardening, forging, etc. Dedicated applications have been created to couple magnetic AC steady state to thermal transient analysis, for instance. What is new is easier
and more effective coupling any type of magnetic application to thermal analysis. This article reviews what thermal analysis is, when the different tools were created, and looks at the latest advances in thermal analysis.



Speeding up Altair OptiStruct* Simulations with the Intel® SSD Data Center Family for PCIe* Speeding up Altair OptiStruct* Simulations with the Intel® SSD Data Center Family for PCIe* Learn More
Speeding up Altair OptiStruct* Simulations with the Intel® SSD Data Center Family for PCIe*
Altair OptiStruct* provides engineers and designers with a unified solution from concept to final design by leveraging advanced analysis capabilities and novel, optimization-driven simulation. In this process, the simulation time for one optimization iteration is a critical consideration, since it affects the computational speed and scalability of the entire design process.


Less Interior Squeak and Rattle Noise Using a Simulation Driven Design Approach Less Interior Squeak and Rattle Noise Using a Simulation Driven Design Approach Learn More
Less Interior Squeak and Rattle Noise Using a Simulation Driven Design Approach
In the development of new vehicles, the PSA Group aimed to detect Squeak and Rattle (S&R) problems before availability of physical testing. This led to a collaboration between PSA’s method development engineering team and Altair’s domain experts.

真のフロントローディングを実現するCAEツールsolidThinking Inspire 真のフロントローディングを実現するCAEツールsolidThinking Inspire Learn More
真のフロントローディングを実現するCAEツールsolidThinking Inspire
『設計者CAE』、『フロントローディング』、どちらもすでに10年以上前から提唱されている言葉である。そして，3次元CADツールには、解析機能を持つCAEのモジュールが組み込まれてきており、環境も整えられつつある。では、実際に、設計者はそれらを使用しているだろうか？

White Paper: How to Digitalize Effectively for IoT White Paper: How to Digitalize Effectively for IoT Learn More
White Paper: How to Digitalize Effectively for IoT
Internet of Things (IoT) is starting to mature and organisations across many sectors are facing the challenges of scaling up from small, trial deployments and proof of concepts into mainstream, high volume consumer deployments.

OptiStruct is 17x faster with the latest Dell Precision Workstation OptiStruct is 17x faster with the latest Dell Precision Workstation Learn More
OptiStruct is 17x faster with the latest Dell Precision Workstation
The reduction of run times up to 17X is a direct result of more powerful hardware and the more advanced algorithms in Altair’s latest software releases.

Platform Support（稼働環境）- HyperWorks 14.0.120/220 Platform Support（稼働環境）- HyperWorks 14.0.120/220 Learn More
Platform Support（稼働環境）- HyperWorks 14.0.120/220
HyperWorks 14.0.120/220（14.0.220 solver packageを含む）がサポートするプラットフォーム、OS、プロセッサー等一覧。

Numerical Wave Tank Analysis of Wave Run-Up On a Truncated Vertical Cylinder Numerical Wave Tank Analysis of Wave Run-Up On a Truncated Vertical Cylinder Learn More
Numerical Wave Tank Analysis of Wave Run-Up On a Truncated Vertical Cylinder
J. Kin, S.Cosgrove, R. Jaiman, and J. O’Sullivan.

VIV Prediction of a Truss Spar Pull-Tube Array Using CFD VIV Prediction of a Truss Spar Pull-Tube Array Using CFD Learn More
VIV Prediction of a Truss Spar Pull-Tube Array Using CFD
Y. Constantinides, S. Holmes, and W. Yu

CFD Based Hydrodynamic Databases for Wake Interference Assessment CFD Based Hydrodynamic Databases for Wake Interference Assessment Learn More
CFD Based Hydrodynamic Databases for Wake Interference Assessment
D. Corson, S. Cosgrove, P. Hays, Y. Constantinides , O. Oakley, H. Mukundan, and M. Leung

Dynamic Analysis of Riser Release and Lowering Dynamic Analysis of Riser Release and Lowering Learn More
Dynamic Analysis of Riser Release and Lowering
S. Atluri, N. Liu, A. Sablok, and T. Weaver

Vortex Induced Vibration Analysis of a Complex Subsea Jumper Vortex Induced Vibration Analysis of a Complex Subsea Jumper Learn More
Vortex Induced Vibration Analysis of a Complex Subsea Jumper
S. Holmes, and Y. Constantinides

Design-Optimization of a Curved Layered Composite Panel Using Efficient Laminate Parameterization Design-Optimization of a Curved Layered Composite Panel Using Efficient Laminate Parameterization Learn More
Design-Optimization of a Curved Layered Composite Panel Using Efficient Laminate Parameterization
In this paper, presented at the 2016 SAMPE Long Beach Conference, an aircraft door surround model is optimized with respect to the objectives and constraints typical for this type of component using HyperStudy and ESAComp.

Brake Noise Prediction Using Altair Multi-body Simulation Brake Noise Prediction Using Altair Multi-body Simulation Learn More
Brake Noise Prediction Using Altair Multi-body Simulation
The level of noise transmitted to the passengers of a vehicle can drastically impact a passenger’s comfort. Brake noise will give the customer an impression of poor product quality and can thus damage the quality image of the company. Within the automotive industry,
the study of mode coupling instability by the use of FEM and modal complex analysis is widespread to reduce this phenomenon.


3D プリンターの能力を最大限に引き出すAltair のトポロジー最適化テクノロジー 3D プリンターの能力を最大限に引き出すAltair のトポロジー最適化テクノロジー Learn More
3D プリンターの能力を最大限に引き出すAltair のトポロジー最適化テクノロジー
大量生産に向かないことや使用できる材料の種類に制限があることなどの問題があるとはいえ、型を作成する必要がなく、従来の製造手法では作成することができなかった複雑な構造物を製造することができる3Dプリンターが使用されることを最初から想定し、その特性を最大限に活用することができる設計手法が必要となる。そのような設計手法の一つとしてのトポロジー最適化についての論文。（「機械設計 5月号」第60巻 第7号掲載）

Design and optimization of a high performance C-Class catamaran with HyperWorks Design and optimization of a high performance C-Class catamaran with HyperWorks Learn More
Design and optimization of a high performance C-Class catamaran with HyperWorks
Reprint of the article published on composite solutions magazine 2/2016.

Benchmark of HyperStudy Optimization Algorithms Benchmark of HyperStudy Optimization Algorithms Learn More
Benchmark of HyperStudy Optimization Algorithms
The objective of this paper is to assess several optimization algorithms in HyperStudy for their effectiveness and efficiency. The following sections of this paper present an overview of the optimization algorithms frequently used in HyperStudy. This is followed by benchmarking of both single objective and multi-objective optimization problems, respectively.

HyperXtrude 2015による押出成形シミュレーション HyperXtrude 2015による押出成形シミュレーション Learn More
HyperXtrude 2015による押出成形シミュレーション
ユーザビリティを大幅に向上させることに焦点を当て、ダイス設計者、現場の生産技術の専門家およびエンジニアが、金型の設計を簡単に検証することを可能にするHyperXtrudeの紹介。（軽金属 第65巻11号）

Slotted Waveguide Array Slotted Waveguide Array Learn More
Slotted Waveguide Array
The slotted waveguide array is a popular choice for use in radar systems due to its mechanical robustness, compactness and ability to handle
high power levels.

Slotted Waveguide Array Slotted Waveguide Array Learn More
Slotted Waveguide Array
The slotted waveguide array is a popular choice for use in radar systems due to its mechanical robustness, compactness and ability to handle
high power levels.

Printed Ka-band Reflectarrays with Offset Feed Printed Ka-band Reflectarrays with Offset Feed Learn More
Printed Ka-band Reflectarrays with Offset Feed
Printed reflectarrays combine the advantages of parabolic reflector antennas with microstrip arrays, yielding high-gain, low-profile, low-cost antennas with simpler feeds that are easy to fabricate. This white paper demonstrates how FEKO can be used to model a printed reflectarray and its feed.

Benchmark Study: Optimizing High Fidelity Crash & Safety Simulation Performance Benchmark Study: Optimizing High Fidelity Crash & Safety Simulation Performance Learn More
Benchmark Study: Optimizing High Fidelity Crash & Safety Simulation Performance
Cray, Intel and Altair have collaborated to analyze crash and safety simulation performance that provides engineers the power, speed and accuracy needed for their design analysis.

FEKO Integrated in HyperWorks 14.0 FEKO Integrated in HyperWorks 14.0 Learn More
FEKO Integrated in HyperWorks 14.0
Altair’s computer-aided engineering (CAE) simulation software platform for simulation-driven innovation is Hyper- Works, which includes modeling, visualization, analysis and optimization technologies and solutions for structural, impact, electromagnetics, thermal, fluid, systems and manufacturing applications. The electromagnetics solver suite in HyperWorks is FEKO, a comprehensive electromagnetic analysis software used to solve a broad range of electromagnetic problems. It includes a set of hybridized solvers, giving the possibility to combine methods to solve complex and electrically large problems, with all solvers included in the same package.

Electromagnetics in Electronics Electromagnetics in Electronics Learn More
Electromagnetics in Electronics
Technology advancement in the electronic industry is unyielding, but new trends will build on RF communications to drive new product functionality. Some examples include the Internet of Things (IoT), 5G mobile networks and automation/smart technology.

Electromagnetic Design in the Electronic Industry Electromagnetic Design in the Electronic Industry Learn More
Electromagnetic Design in the Electronic Industry
Technology advancement in the electronic industry is unyielding, but new trends will build on RF communications to drive new product functionality. Some examples include the Internet of Things (IoT), 5G mobile networks and automation/smart technology.

Intel Solution Brief: Altair and Simulation-Driven Design Intel Solution Brief: Altair and Simulation-Driven Design Learn More
Intel Solution Brief: Altair and Simulation-Driven Design
Altair and Intel offer a simple, cost-effective on-ramp to a complete simulation-driven design platform. This paper describes joint offerings including HPC and CAE in the public cloud.

Intel Solution Brief: Maximize Performance and Scalability with RADIOSS on Intel® Xeon® Intel Solution Brief: Maximize Performance and Scalability with RADIOSS on Intel® Xeon® Learn More
Intel Solution Brief: Maximize Performance and Scalability with RADIOSS on Intel® Xeon®
This paper summarizes the findings of a benchmark project to evaluate the performance and scalability of RADIOSS on Intel® Xeon® Processor E7 v2 family-based platforms.

Seat Design for Crash in the Cloud - NAFEMS World Congress 2015 Seat Design for Crash in the Cloud - NAFEMS World Congress 2015 Learn More
Seat Design for Crash in the Cloud - NAFEMS World Congress 2015
The benefit of design exploration and optimization is understood and accepted by engineers but the required intensive computational resources have been a challenge for their adoption into the design process. The HyperWorks Unlimited (HWUL) appliance provides an effective solution to these challenges as it seamlessly connects all the necessary tools together in the cloud. The aim of this study is to showcase the benefits of HWUL on an optimization driven design of a complex system. For this purpose an automotive seat design for
crash loadcases is selected.

Fluid - Structure Interaction Analysis and Optimization of an Automotive Component Fluid - Structure Interaction Analysis and Optimization of an Automotive Component Learn More
Fluid - Structure Interaction Analysis and Optimization of an Automotive Component
This paper discusses the behavior of a flexible flap at the rear end of a generic car model under
aerodynamic loads. A strong bidirectional coupling between the flap’s deflection and the flow
field exists which requires this system to be simulated in a coupled fluid-structure manner.

Tanker Truck Sloshing Simulation Using Bi-directionally Coupled CFD and Multi-Body Dynamics Solvers Tanker Truck Sloshing Simulation Using Bi-directionally Coupled CFD and Multi-Body Dynamics Solvers Learn More
Tanker Truck Sloshing Simulation Using Bi-directionally Coupled CFD and Multi-Body Dynamics Solvers
In this work, the multi-disciplinary problem arising from fluid sloshing within a partially filled
tanker truck undergoing lateral acceleration is investigated through the use of multiphysics
coupling between a computational fluid dynamics (CFD) solver and a multi-body dynamics
(MBD) solver. This application represents a challenging test case for simulation technology
within the design of commercial vehicles and is intended to demonstrate a novel approach
in the field of computer aided engineering.

Efficient Design and Analysis of Airborne Radomes Efficient Design and Analysis of Airborne Radomes Learn More
Efficient Design and Analysis of Airborne Radomes


Computer Simulation's Role in Advancing Composite Aircraft Structures Computer Simulation's Role in Advancing Composite Aircraft Structures Learn More
Computer Simulation's Role in Advancing Composite Aircraft Structures
Reprint of an article published on the December 2014 issue of Aerospace & Defense Technology magazine


Optimization Drive Design - A Desktop Engineering Sponsored Report Optimization Drive Design - A Desktop Engineering Sponsored Report Learn More
Optimization Drive Design - A Desktop Engineering Sponsored Report
Optimize every stage of product development with an integrated workflow that democratizes simulation and analysis. In this Desktop Engineering sponsored report Altair's vision for product optimization is analyzed

Optimizing Cooling Passages in Turbine Blades Optimizing Cooling Passages in Turbine Blades Learn More
Optimizing Cooling Passages in Turbine Blades
Turbine blades have internal passages that provide cooling during operation in a high
temperature engine. The design of the cooling passages is critical to achieve near uniform
temperature of the blade during operation. The temperature of the blade is dependent on the thermal properties of the blade material as well as the fluid dynamics of the air circulating in the cooling passages. Computational optimization methods have successfully been applied to design lighter and more efficient structures for many aerospace structures. An extension of these techniques is now applied to guiding the thermal design of a turbine blade by designing the optimal cooling passage layout. Optimization methods will be applied to determine the optimum pattern of the cooling passages and then to optimize the size of the individual cooling passages. The goal is to produce a more thermally efficient turbine blade design that will produce blades with longer lives and better performance.


包装貨物へのシミュレーション解析適用例（日本包装学会誌 Vol .23 No.4 2014） 包装貨物へのシミュレーション解析適用例（日本包装学会誌 Vol .23 No.4 2014） Learn More
包装貨物へのシミュレーション解析適用例（日本包装学会誌 Vol .23 No.4 2014）
包装の分野でも、設計や評価において、シミュレーション解析をうまく活用することで、「試作（金型製作を伴う場合も）→評価→不合格による手戻り」のプロセスを最小限にとどめることができるようになり、開発期間やコストの大幅な削減につなげられることが期待されている。また、実際にそういった効果が得られた事例なども報告されている。
シミュレーション解析には、用途に応じて様々な手法、ツールがあるが、ここでは「包装貨物」の評価のためにシミュレーション解析を応用した事例を二つ紹介する。

Benchmark Study: Optimized Drop Testing with Dell, Intel and Altair Benchmark Study: Optimized Drop Testing with Dell, Intel and Altair Learn More
Benchmark Study: Optimized Drop Testing with Dell, Intel and Altair
Dell, Intel and Altair have collaborated to analyze a virtual drop test solution with integrated simulation and optimization analysis, delivering proven gains in speed and accuracy.

Improving the Design of Subsea Riser Systems A Cray-Altair Solution for Improved Oil & Gas Component Engineering Improving the Design of Subsea Riser Systems A Cray-Altair Solution for Improved Oil & Gas Component Engineering Learn More
Improving the Design of Subsea Riser Systems A Cray-Altair Solution for Improved Oil & Gas Component Engineering
With Cray and Altair, engineers have the computational systems they need to perform advanced subsea computational fluid dynamics (CFD) analysis with better speed, scalability and accuracy. With Altair’s AcuSolve CFD solver running on Cray® XC30™ supercomputer systems, operators and engineers responsible for riser system design and analysis can increase component life, reduce uncertainty and improve the overall safety of their ultra-deep-water systems while still meeting their demanding development schedule.

容器設計のための流体・構造連成事例（PDF） 容器設計のための流体・構造連成事例（PDF） Learn More
容器設計のための流体・構造連成事例（PDF）
より高機能、より安全な容器を求めて、これまで独立に扱われてきた容器内の流体現象と容器の変形応答を同時に扱う流体・構造相関解析（FSI: Fluid-Structure Interaction）への関心は徐々に高まってきている。そこで、本論分では、FSIの基礎となる概念をまとめた上で、四つの流体・構造相関（構造・流体共に既知FSI、剛体構造変形FSI、線形弾性構造変形FSI）解析を示し、超弾性体構成則ALE（Arbitrary Lagrangian Eulerian）を用いた容器内の流体・構造相関の現状と可能性を示した。

Weld Distortion Optimisation using HyperStudy Weld Distortion Optimisation using HyperStudy Learn More
Weld Distortion Optimisation using HyperStudy
Distortion induced in parts due to the cooling of welds complicates automated manufacturing lines in the automotive industry. The resulting deformation leads to additional investment such as end of line machining to correct affected assemblies. Utilising optimisation software a welding pattern can be found which retains the intended performance of a part while reducing the distortion induced from welding. Weld locations may be optimised alongside welding sequence to allow process requirements to be considered within the early design stage. This leads to high performance, low distortion assemblies which can ultimately be manufactured at the lowest possible cost.

【PBS日本語資料】Virtual Wind Tunnelシミュレーションの活用 【PBS日本語資料】Virtual Wind Tunnelシミュレーションの活用 Learn More
【PBS日本語資料】Virtual Wind Tunnelシミュレーションの活用
外部空気力学の最適化のためのCray とAltair のソリューション

Optimal Design Exploration Using Global Response Surface Method: Rail Crush Optimal Design Exploration Using Global Response Surface Method: Rail Crush Learn More
Optimal Design Exploration Using Global Response Surface Method: Rail Crush
As design exploration and optimization methods have become commonly accepted across a range of industries, such as aerospace, automotive or oil and gas, they are frequently utilized as standard practice to efficiently produce designs and aid critical engineering decisions. This paper present an overview of the practical usage of Altair HyperStudy's GRSM optimization algorithm, followed by application problems of rail
crush design optimization for a single and multi-objective formulation.


Streamlining Aerodynamic CFD Analyses Streamlining Aerodynamic CFD Analyses Learn More
Streamlining Aerodynamic CFD Analyses
External aerodynamic simulations using computational fluid dynamics (CFD) are well established tools in the product development process for
the automotive and aerospace industries. CFD simulation technology helps engineers to understand the physical phenomena taking place in
their design and provides an environment to optimize the performance with respect to certain design criteria.

Using PBS Professional Hooks: Examples and Benefits Using PBS Professional Hooks: Examples and Benefits Learn More
Using PBS Professional Hooks: Examples and Benefits
This paper examines practical uses of the PBS Professional® hook mechanism, to help achieve site requirements, based on experiences at The University of Queensland Research Computing Centre. The paper includes descriptions of several real-world applications for job submission hooks (qsub_hook) and includes example code to help commence implementation of a generic hook able to handle both job submission and job modification events.

Schlumberger Eclipse Integration White Paper and How-To Guide Schlumberger Eclipse Integration White Paper and How-To Guide Learn More
Schlumberger Eclipse Integration White Paper and How-To Guide
The Schlumberger ECLIPSE software family offers the industry’s most complete and robust set of reservoir simulation software. In response to user requests, Altair has collaborated with Schlumberger to deliver a tightly integrated version of ECLIPSE for PBS Professional. This paper documents the integration and provides step-by-step instructions for configuration and use.

Daimler - Calculation of Optimal Damping Placement in a Vehicle Interior Daimler - Calculation of Optimal Damping Placement in a Vehicle Interior Learn More
Daimler - Calculation of Optimal Damping Placement in a Vehicle Interior
One of the most difficult jobs of a NVH Analyst is to sift through a seemingly endless set of results and find the key conclusions that will improve a design. Different assumptions and different subsets of data can give very different conclusions. This paper compares acoustic results calculated for a Class 8 heavy duty truck cab to choose an optimal configuration of damping material. The design was evaluated for structure and air-borne inputs, but only structure-borne inputs are considered in this paper.

Automotive Development: All Eyes on CAE Weight Management Automotive Development: All Eyes on CAE Weight Management Learn More
Automotive Development: All Eyes on CAE Weight Management
The automotive development process
is still focused on objectives such as
durability and crash safety, while weight is often limited to the very end of the design process. Through the establishment of the “Optimization Center” (OC) concept, Altair ProductDesign has developed an innovative
design model combining performance
features with weight reduction goals. This article describes the OC concept dealing with everything from the optimization of single components to an entire optimization process known as “CAE
Weight Management”.

Applications of Advanced Composite Simulation and Design Optimization Applications of Advanced Composite Simulation and Design Optimization Learn More
Applications of Advanced Composite Simulation and Design Optimization
Usage of fiber reinforced composite material entered an new era when leading aircraft OEMs took an unprecedented step to design and manufacture essentially full composite airframe for commercial airliners. Composite structures offer unmatched design potential as the laminate material properties can be tailored almost continuously throughout the structure. However, this increased design freedom also brings new challenges for the design process and software. Moreover, as a relatively new material, composite behaviors are more complex and less fully understood by design engineers. Therefore, reliable simulation for highly complex events like bird strike and ditching can play an important role in shortening the product design cycle. This paper showcases two area of CAE tools for composite applications. On advanced simulation, bird strike simulation with Altair RADIOSS [1] is demonstrated on an aircraft underbelly fairing. On design optimization, an airplane wing structure is designed using an innovative composite optimization process implemented in Altair OptiStruct [1-3]. OptiStruct has seen increasing adoption among aerospace OEMs, as demonstrated in the Bombardier application process described in this paper.

Scheduling Jobs onto Intel® Xeon Phi™ using PBS Professional Scheduling Jobs onto Intel® Xeon Phi™ using PBS Professional Learn More
Scheduling Jobs onto Intel® Xeon Phi™ using PBS Professional
Working closely with Intel, Altair has ensured that PBS Professional supports the Intel® Xeon Phi™ architecture targeting high performance computing applications. This paper describes the basic and advanced configurations of PBS Professional for scheduling jobs onto Intel Xeon Phi devices.


PBS users: Download the toolkit to automate configuration of PBS for a Xeon Phi environment

PBS Professional Utilizes Intel Cluster Checker to Validate the Health of an HPC Cluster PBS Professional Utilizes Intel Cluster Checker to Validate the Health of an HPC Cluster Learn More
PBS Professional Utilizes Intel Cluster Checker to Validate the Health of an HPC Cluster
On clusters that are Intel® Cluster Ready (ICR) certified, PBS Professional can utilize Intel® Cluster Checker for gathering real-time information about the cluster at the very moment a job has been scheduled. Using this immediate feedback, PBS Professional can ensure that a job is only being executed on a cluster that has passed a check by Intel Cluster Checker.

An Aerodynamic Study of Bicycle Wheel Performance Using CFD An Aerodynamic Study of Bicycle Wheel Performance Using CFD Learn More
An Aerodynamic Study of Bicycle Wheel Performance Using CFD
A methodology is presented to apply CFD to study air flow around a rotating bicycle wheel in contact with the ground. The bicycle wheel studied here is an accurate geometrical representation of a commercial racing wheel (Zipp 404). Reynolds-Averaged Navier Stokes (RANS) and Delayed Detached Eddy Simulation (DDES) results are computed at a range of speeds and yaw angles commonly encountered by cyclists. Drag and side (or lift) forces are resolved and compare favorably to experimental results obtained from wind tunnel tests. Vertical forces acting on a rotating bicycle wheel are presented for the first time. A unique transition from downward to upward acting force is observed as the yaw angle is increased. Flow structures are identified and compared for different yaw angles. It is expected that a more complete comprehension of these results will lead to improvements in the performance and handling characteristics of bicycle racing wheels used by professional cyclists and triathletes.

A Comparative Aerodynamic Study of Commercial Bicycle Wheels Using CFD A Comparative Aerodynamic Study of Commercial Bicycle Wheels Using CFD Learn More
A Comparative Aerodynamic Study of Commercial Bicycle Wheels Using CFD
A CFD methodology is used to study the performance of several commercial bicycle wheels over a range of speeds and yaw angles. The wheels studied in this work include the Rolf Sestriere, HED H3 TriSpoke, the Zipp 404, 808 and 1080 deep rim wheels and the Zipp Sub9 disc wheel. Wheels are modeled at speeds of 20mph and 30mph, in contact with the ground, using Reynolds-Averaged Navier Stokes (RANS). Drag, vertical and side (or lift) forces are reported for each wheel. Turning moments are also calculated using the resolved side
forces to examine aspects of stability and maneuverability. Drag and side forces over the range of yaw angles studied compare favorably to
experimental wind tunnel results. The previously reported unique transition from downward to upward acting vertical force on the Zipp 404 wheel for increasing yaw angles is observed for all deep rim wheels and the disc wheel studied here. Wheels were also modeled at a critical yaw angle of 10 degrees using Delayed Detached Eddy Simulation (DDES) to examine the transient aspects of flows around moving bicycle wheels. It is hoped that a more complete comprehension of these results will lead to improvements in performance, safety and control of bicycle racing wheels used by amateur and professional cyclists and triathletes.

A Practical Analysis of Unsteady Flow Around a Bicycle Wheel, Fork and Partial Frame Using CFD A Practical Analysis of Unsteady Flow Around a Bicycle Wheel, Fork and Partial Frame Using CFD Learn More
A Practical Analysis of Unsteady Flow Around a Bicycle Wheel, Fork and Partial Frame Using CFD
CFD is used to study air flow around a rotating bicycle wheel in contact with the ground, extending previous ‘wheel-only’ work on this problem by including the fork, head tube, top tube, down tube, caliper and brake pads. Unsteady simulations, using a Delayed Detached Eddy Simulation (DDES) turbulence model, were run for 9 different wheel and front fork configurations, over 10 different operating conditions (5 yaw angles, repeated for two different speeds, commonly encountered by cyclists), resulting in 90 transient design points.

Operational Numerical Weather Prediction Job Scheduling at the Petascale Operational Numerical Weather Prediction Job Scheduling at the Petascale Learn More
Operational Numerical Weather Prediction Job Scheduling at the Petascale
Several operational numerical weather prediction (NWP) centers will approach a petaflop of peak performance by early 2012 presenting several system operation challenges. An evolution in system utilization strategies along with advanced scheduling technologies are needed to exploit these breakthroughs in computational speed while improving the Quality of Service (QoS) and system utilization rates. The Cray XE6™ supercomputer in conjunction with Altair PBS Professional® provides a rich scheduling environment designed to support and maximize the specific features of the Cray architecture.

An Integrated Approach to Workload and Cluster Management: The HP CMU PBS Professional Connector An Integrated Approach to Workload and Cluster Management: The HP CMU PBS Professional Connector Learn More
An Integrated Approach to Workload and Cluster Management: The HP CMU PBS Professional Connector
This paper describes the integration between Altair’s PBS Professional and HP’s Insight Cluster Management Utility (CMU), explaining how the concept of a “connector “unites these two tools to simplify cluster setup and job execution, and providing instructions for performing key PBS Professional tasks within Insight CMU. Click here to access more CMU resources.

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