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Pointwise Releases Gridgen V14 Beta
Posted Mon November 26, 2001 @10:46AM
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Grid Generation The latest version of Pointwise's flagship CFD pre-processor, Gridgen, was recently released for beta testing. Gridgen V14 marks a major enhancement to the Gridgen software.

The most significant new feature is the Glyph scripting language. Glyph is an advanced "high level" language which will provide users with the ability to generate CFD grids parametrically. Glyph also features a journaling capability which allows playback of an interactive Gridgen session.

"CAE analysts have been pushing for better integration of CFD into the design process for years", said John Chawner, Pointwise's president. "By working closely with customers very early in the development cycle we were able to develop Glyph with capabilities that meet their specific requirements for customization, automation, and interoperability."

Another feature added to Gridgen for V14 is the ability to import native CAD files from a number of popular CAD programs. The ability to skip neutral file formats, such as IGES, streamlines the CFD process for Gridgen users.

In addition, this version of Gridgen will allow users to treat faceted triangular surfaces as geometry for mesh generation. Gridgen supports faceted surfaces in STL, VRML and other popular formats.

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Aeroacoustic Analysis Using STAR-CD
Posted Thu November 22, 2001 @08:29AM
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CD-adapco In this article, CD adapco have described the type of aeroacoustic analysis possible with their CFD software. Aeroacoustic analysis, or noise prediction, is of primary interest for comfort and safety considerations in many industry sectors, such as, automotive, aerospace, and rail.

STAR-CD offers two methods for the prediction of noise. The first is aimed at capturing broad-band turbulence-based shear noise. The turbulence fields from a steady-state Reynolds Averaged Navier Stokes (RANS) simulation are post-processed to predict the shear-noise distribution in the flow field. This is a new feature in the STAR-CD software.

A second method, used for predicting coherent noise, utilizes the transient flow solver to predict the combined convection and pressure wave effects acting on surfaces. The standard RANS turbulence model and transient flow solver have long been a part of the STAR-CD package.

These two methods allow the CFD engineer to predict both resonant and broad-band based noise in the flow field.

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Application: ESA's Use of CFD on the ISS
Posted Wed November 21, 2001 @11:47AM
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Application The European Space Agency (ESA) is using CFD in the design of enviromental control facilites in the Automated Transfer Vehicle (ATV) and to predict gas impingement forces in the sensitive Columbus laboratory on the International Space Station (ISS).

The ATV is used for delivering equipment and consumables to the ISS and for orbital re-boosting when the ISS has lost altitude due to atmospheric friction. The Integrated Cargo Carrier (ICC) module, located at the front of the ATV, carries dry cargo which is placed in up to 8 racks mounted in the cylindrical portion of the ICC.

The ICC does not have an advanced enviromental control system, but does have a cabin fan designed to guarantee good ventilation and to ensure an adequate air distribution for crew comfort. Another primary goal of the fan is to avoid any stagnant flow regions in which toxic gases could accumulate and pose a suffocation threat to the astronauts. In addition, the air speed should be always lower than 0.25 m/s in the crew cabin, whereas the air temperature should be less than 28°C, but more than the minimum dew temperature of 16°C. Also, the 'touch temperatures' of surfaces exposed to the crew should not exceed 45°C.

Rather than build an expensive experimental apparatus to test the flow field in the ICC, ESA turned to CFDRC for CFD software which could be used to predict the flow field within the ICC.

( Read Full Article | Application )


Application: Designing the Optimum Swim Stroke
Posted Tue November 20, 2001 @09:39AM
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Application Researchers at USA Swimming have been using FLUENT to model the flow around the hand and forearm of a swimmer during the propulsive phases of the freestyle and butterfly strokes. The program aims to determine the optimum swim stroke to provide maximum propulsive performance for elite swimmers.

During the initial stage of the investigation, researchers sought to determine the steady-state lift and drag coefficients for the hand and arm. The model for these simulations used k-epsilon turbulence modeling with non-equilibrium wall functions. Adaptive meshing was utilized to increase solution accuracy.

( Read Full Article | Application )


CFX Backs Team New Zealand
Posted Mon November 19, 2001 @10:10AM
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ANSYS CFX Team New Zealand, which as we previously reported is backed by SGI, has now received support from AEA Technology as the official CFD supplier to the team for the 2003 America's Cup challenge.
As defending champions, having won the America's Cup in 1995 and 2000, Team New Zealand hopes that CFX CFD software will enable them to achieve a third consecutive win - ensuring the team a place in the record books.
To improve the yacht's performance, Team New Zealand designers will be modelling wave patterns and drag around the hull. In particular, CFX is being used to calculate the drag on the keel bulb. A number of different keel bulb shapes are being examined to determine a design which provides the lowest center of gravity while minimizing drag. In addition, the team is studying induced drag on the appendages and using CFX to model sail aerodynamics.

( Read Full Article )


CFX Forms Alliance With PCA For Turbo Design
Posted Mon November 19, 2001 @09:51AM
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ANSYS CFX AEA Technology has announced an alliance with PCA Engineers Limited to offer a combined range of turbomachinery design software and services. PCA Engineers Limited is an international engineering consultancy specialising in design of turbomachinery and the development of turbomachinery design software. The agreement finalizes a working relationship which has spanned many years.
According to Dr.-Ing. Georg Scheuerer, CFX European Operations Director: “This Alliance will link both companies’ aspirations in turbomachinery design and analysis consultancy, turbomachinery design software and the development of advanced systems such as unsteady aero-mechanical software”.

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