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Happy Holidays
Posted Sun December 23, 2001 @10:30PM
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CFD Review Merry Christmas and a Happy New Year to everyone. Thank you for your support in 2001. With your continued support, 2002 will be a fantastic year.

Here's wishing you the best in 2002.

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AIAA Year in Review - CFD Activities
Posted Fri December 21, 2001 @06:18PM
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News Aerospace America has issued its annual Year in Review issue which covers, among other things, the accomplishments of the various AIAA Technical Committees.

Highlights of the Technical Committees in the CFD field include:

Applied Aerodynamics
  • CFD was used in the design of a micro air vehicle optimized using a genetic algorithm. The work was sponsored by DARPA.
  • NASA Glenn, Lockheed Martin, and the US Airforce Research Lab used CFD to optimize ultracompact inlet diffuser ducts.
  • NASA Langley computed N-S solutions on multi-block grids for an advanced diamond wing concept. The results showed excellent agreement with data from the National Transonic Facility wind tunnel.
  • NASA Ames computed high resolution solutions of a UH-60A helicopter in hover using meshes with 10.6 and 64 million grid points. In addition to providing a wealth of detailed flow field information, the results show that rotorcraft CFD simulations can provide accurate quantitative performance results as well.
  • NASA's PAB3D solver was used to compute aeroacoustic solutions for round and chevron nozzles.
  • ARL used FLUENT 5 to compute viscous solutions on lattice finned missiles. The article states: "Mesh generation is the challenge for this class of problems, because it is difficult to resolve the boundary layer flow around the missile body and the individual fin surfaces while keeping the model size manageable."
  • A drag prediction workshop was held during the summer.

( Read Full Article )


FLUENT 6.0 Released
Posted Fri December 21, 2001 @10:54AM
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ANSYS FLUENT Fluent has released the latest version of their flagship CFD software. FLUENT 6.0 features industry firsts and usability enhancements. The new offering, which is based on Fluent's time-tested unstructured CFD platform, has notable leaps forward in the modeling of multiphase, rotating equipment, and combustion problems.

Fluent's beta test program has ensured that each new capability has been tested on a real-world industrial problem. The extensive testing performed by Fluent and their beta testers reduces the amount of validation necessary for adopters of the new code.

A new Eulerian granular model is available in FLUENT 6.0. This capability is necessary to correctly predict the behavior of solids in multiphase flows. The formulation includes the solids pressure and can accurately describe transitions in the solids phase as the packing limit is reached. The Eulerian granular model is intended for applications such as fluidized beds, risers, solids suspension, and sedimentation.

Other enhancements include dynamic load balancing for parallel simulations, new spray models including both primary and secondary atomization, VRML output, and turbo-specific post-processing on unstructured grids.

The new software also debuts moving/deforming mesh for analysis of in-cylinder engine performance as a beta capability.

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SGI Origin 300 a Gem for Low-Cost HPC
Posted Thu December 20, 2001 @11:30AM
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Hardware Many mechanical computer-aided engineering (MCAE) applications benefit from high-performance computing (HPC) technology. CFD in particular benefits from the large memory bandwidth and fast processors of HPC machines. CFD also benefits extremely well from parallel environments, efficiently scaling to hundreds of processors.

A system architecture that can achieve high parallel efficiency becomes important for large CFD simulations. The same multiprocessor architecture found in the largest shared memory parallel (SMP) system currently available, the SGI Origin 3800, is available in the more affordable SGI Origin 300 system.

The HPC technology offered with the new midrange SGI Origin 300 server is well-suited to the demands of each MCAE application segment. In particular, the choice offered with SGI Origin 300 as a moderately configured SSI for departmental deployment, or as a large cluster for scalable DMP applications, provides substantial performance benefits to MCAE applications for a range of modeling requirements.
Using the SGI Origin 300, CFD simulations can be performed at levels nearly equivalent to the industry-leading SGI Origin 3000 series up to 32 processors, but at roughly half the cost.

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AIAA CFD Drag Prediction Workshop Results
Posted Wed December 19, 2001 @12:27PM
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News The AIAA CFD Drag Prediction Workshop was held June 9-10, 2001 in Anaheim, CA. The workshop was held to assess the state-of-the-art in computational methods for aircraft force and moment prediction with emphasis placed on the prediction of drag polar and drag rise.

The test configuration was a DLR-F4 model which had been tested in three European transonic facilities. Participants were provided with multiblock structured, overset, and unstructured grids on which to perform baseline cruise-point calculations.

Twenty participants provided solutions and 51 individuals attended the workshop from the U.S., Canada, Europe, and Brazil. At the cruise point, the standard deviation of CFD solutions was 20 drag counts (0.0020), whereas the standard deviation in the wind tunnel data was approximately 5 drag counts. A similar workshop held in the 1990s used the same geometry and resulted in a standard deviation of approximately 50 drag counts.
The results and remarks are available online.

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HP Shipping New CAE Workstation
Posted Wed December 19, 2001 @11:40AM
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Hardware HP is now shipping the c3650 workstation which features a 625 MHz PA-RISC 8700 processor and is aimed at senior designers, analysts and scientific researchers. The system can be equipped with up to 8 GB of memory and full-featured HP fx10pro graphics.
With its complete offering of graphics capabilities, the HP workstation c3650 provides MCAD and CAE customers with the compute power they need to solve today's resource-hungry design tasks cost-effectively. It is ideal for visualizing designs, models, mechanical design, and solid-modeling work.

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