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Team NZ Using SGI for Boat Design
Posted Thu October 18, 2001 @05:21PM
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Hardware SGI has supplied defending America's Cup champion Team New Zealand with UNIX workstations to be used for CFD analysis of the boat's hull, keel, wings and sails.
Although many boat parts are now totally computer designed, for some key parts, such as the hull, there is still no substitute for the traditional method of physically building models and testing them in tow tanks.

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CFX-ProMixus Seminars
Posted Thu October 18, 2001 @08:59AM
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News CFX-ProMixus is a software tool for optimising mixing and reaction vessels. CFX is organising seminars with "hands-on" sessions during October and November at the following venues: 31 October - Ware, UK; 2 November - Cork, Ireland; 5 November - Brussels, Belgium; 7 November - Amsterdam, Netherlands; 8 November - Barcelona, Spain; 9 November - Tarragona, Spain. For a registration form please contact Lin Hall on +44 1235 448018 e-mail: or visit our web-site

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A Novel Approach to Fluid-Structure Interaction
Posted Wed October 17, 2001 @04:37PM
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News CD adapco Group has released EZ-FSI a software tool for analyzing fluid-structure interaction problems. A brochure is available which describes the product and its novel approach to coupling structural analysis with CFD.

Typical fluid-structure interation (FSI) simulations attempt to couple the full structural analysis FEA code with the CFD solver and compute the structural stresses and deformations after each iteration. The approach taken in the EZ_FSI product takes advantage of a lumped-mass model of the solid part to simplify the analysis.

First, the solid part is meshed and the fluid-structure interaction points (the "wetted" points) are identified. The solid part is then analyzed to determine lumped mass, damping, and stiffness values for the wetted points. The lumped system will behave exactly as the full system for linear systems with small deformations.

Next, the fluid portion of the domain is meshed and the fluid structure interaction points are identified as a special moving boundary. As the transient, CFD solution progresses, the pressure on the wetted points is used as a forcing function on the lumped mass system to determine the new location at the current time. The boundary is moved to the new location, the CFD mesh is updated, and the process repeats. This is all done within the CFD solver -- eliminating the need to communicate with an external structural analysis package every iteration.

Finally, after completing the CFD analysis, the transient pressure data can be imported into the structural analysis package to determine dynamic stresses within the solid.

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CFDRC to Develop Urban Dispersion Tool
Posted Tue October 16, 2001 @10:20AM
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News At a time when it is unfortunately very topical, CFDRC has been awarded a contract to develop simulation tools to model the dispersal of nuclear, chemical, biological, and radiological (NCBR) substances in urban areas.

The tool, dubbed the Urban Dispersion Simulator (UDS), must overcome such modeling obstacles as geometry acquisition, meshing, and attaining a solution on building to city blocks scale. Additionally, prevailing wind and turbulence fields, buoyancy, solar radiation, tree-induced flow losses, HVAC effects, and the dispersal of gas-phase agents as well as solid and liquid dispersants must be considered.

To facilitate rapid modeling of such large-scale structures, CFDRC has hit upon an image based approach to model generation. By analyzing an image representing a height map of the area of interest, a voxel-based solid model is created. The solid model is then used to create a CFD mesh using a 2N tree-based mesh generator.

The UDS development is being funded under a Small Business Innovation Research contract through the Defense Threat Reduction Agency.

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COSMOS/Flow to be Embedded in SolidWorks
Posted Mon October 15, 2001 @05:34PM
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News Structural Research and analysis Corp and Blue Ridge Numerics have announced that the upcoming release of COSMOS/Flow will be integrated inside SolidWorks.
This new level of integration will allow Fluid-Structure interaction between COSMOS/Works and COSMOS/Flow. Fluid-Structure interaction allows transfer of wall forces, computed during CFD analysis, to a structural analysis study. No other analysis software allows this type of coupled analysis for SolidWorks users.
Integration of CFD into solid modeling packages seems to be a trend.

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Bubble Interaction - Simulating Multiphase Flows
Posted Fri October 12, 2001 @11:03AM
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Application There is some interesting research being done at Worcester Polytechnic Institute on how bubbles interact in a rising column. By using DNS on the complex motions of a large number of bubbles, the researchers have shown that rising bubbles do follow some fundamental structure -- for spherical bubbles at least.

Spherical bubbles tend to rise in pairs, if one bubble is behind, following in the wake of another, it gets speeded up in the upward-moving wake, catches up, hits the top bubble, they tumble, and then both travel in horizontal alignment.

However, the shape of the bubble is dependent on the surface tension of the fluid.

"But as the surface tension drops and the bubbles flatten, this forces the flow to go around in a different way. The ellipsoidal bubbles become little winglets, and that changes the direction of the lift, completely reversing it so that it draws them into the faster moving fluid found in the wakes of passing bubbles. As a result, unlike spherical bubbles, flattened bubbles will sometimes stream together, following each other up in narrow columns,"
To do this, the researchers have developed a method for tracking the deforming bubble surface as a triangulated 2-D grid as it progresses across a fixed grid. This allows for the accurate simulation of 3D systems with a large number of bubbles over a long period of time.

In the future, the researchers hope to extend the model to include phase change and mass transfer as well as modeling fundamentally different bubble behavior, for example large single bubbles which can wobble and follow a spiraling pattern as they ascend.

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