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CFX Answers Back
Posted Mon September 30, 2002 @03:50PM
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News Dr. Michael Raw, Vice President of Product Development for CFX and one of the original authors of the CFX series of CFD solvers, has written back with answers to the questions posted here recently.

Before we get to the answers, I would like to thank Dr. Raw for his prompt reply. Heading up product development at CFX is a very time-consuming job and I am thankful for his time.

Now, on to the questions and answers...

( Read Full Article )

Application: CFX Aids Development of Wind Tunnel
Posted Mon September 30, 2002 @05:13AM
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Application Information from Trevor Bender, Aiolos Engineering

Aiolos Engineering saved time and costs in the development of a 100-meter long wind tunnel by using CFX computational fluid dynamics (CFD) software instead of physical testing. Building and testing a scale model was ruled out because it was expensive and required more time than was allotted for the design of the entire facility. By creating a CFD model of the wind tunnel, Aiolos was able to evaluate many design parameters in a fraction of the time required to design and build a model wind tunnel and to implement a test program. Engineers used CFD to evaluate different wall divergence angles and roughness conditions of the test section to meet a key design challenge: to achieve a reasonable trade-off between the axial static pressure and velocity gradients over the full range of train shapes and sizes. "Ideally, both the static pressure and velocity should be constant along the entire length of the test vehicle," says Trevor Bender, aerodynamicist at Aiolos Engineering. "With CFD, we could perform many trade-off studies to find the optimal balance between those two factors."

( Read Full Article | Application )

New Software: CFDStudio/ANSWER V5.5 Released
Posted Fri September 27, 2002 @10:48AM
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News CFDStudio/ANSWER v5.5 is the new release of the well-established ANSWER CFD Software Tool developed by ACRi. The general purpose Navier-Stokes solver, ANSWER, now comes bundled with CFDStudio, the integrated development environment for CFD applications. Among the many new features are:

# Gridless Computing (2D only; 3D under development),

# Dynamic english-language programming for user-specified physics (without FORTRAN or C Programming),

# Multi-physics capability,

# Versatile library of functions for field variables, fluid properties, sources, and initial and boundary conditions,

# Hybrid elements such as hexahedra, prisms, pyramids, tetrahedra, triangles and quads. Any combination of elements are acceptable.

# Adaptive Gridding / Auto Refinement at runtime based on flexible user-specified runtime criteria.

# If-then-else type of conditional statements.

# Expanded and improved library of matrix solvers,

# Computational improvements and enhancements for efficiency and versatility of application.

--- CFDStudio is the new Integrated Development Environment (IDE) developed by ACRi, for use in CFD problem setup, runtime and postprocessing.

In technical terms, CFDStudio is a "wysiwyg" (what you see is what you get) type of development environment for CFD applications. That is, as you are setting up a CFD problem, there is never a blind spot, you can always visualize what type of boundary condition you are specifying, and to what region. Any specification that you have provided can be viewed at a later time.

The entire development environment is built on a "point-and-click" approach, minimizing the guess work. The problem setup (specification of geometry, initial and boundary conditions, sources, sinks, fluid properties, solution and output options etc.), initiation and graphical representation of CFD solution, as well as the postprocessing of the results (including contours, vectors, slices, etc) are all done in the CFDStudio environment, eliminating the need for 3rd party software, and flattening the learning curve even for the most novice CFD software user.

For detailed information, or to request a 30-day free evaluation copy (qualifying professionals only) please visit CFDStudio/ANSWER website at:

( Post Comment | New Software )

European CFX Conference A Success
Posted Fri September 27, 2002 @10:45AM
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News The European CFX Conference 2002 took place in Strasbourg, France September 16-18. Two hundred participants from all parts of Europe, North America, and Asia attended this outstanding event, where more than fifty technical presentations were given in three parallel sessions.

One of the highlights of the CFX Conference was the invited lecture given by Nick Holroyd from Team New Zealand, which will defend the America's Cup next year, on the use of CFX to increase their competitive advantage in yacht design. Five short courses on turbulence, combustion, turbo machinery, multi-phase flow, and HVAC & fire and safety were very well attended and provided an up-to-date overview of the knowledge in each field. Seventeen booths formed an interesting exhibition which provided additional information to the participants. Social highlights included excellent French cuisine in a restaurant close to Strasbourg's medieval cathedral and in an old winery.

( Post Comment )

New Software: GiD 7 Mesh Generator Released
Posted Mon September 23, 2002 @04:38AM
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Grid Generation Version 7 of the pre and postprocessing program GiD has been released. This software product is widely used to generate meshes for CFD analysis. It supports the following type of mesh elements:
  • Structured/Unstructured triangles/Quads
  • Structured hexas
  • Unstructured tetras
GiD is also a powerful tool for CFD postprocessing

Among others, one of the CFD programs that uses GiD is Tdyn

( Post Comment | New Software )

Visualization: 3D Display Without Special Glasses
Posted Mon September 23, 2002 @03:53AM
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Hardware Philips Research is working on an LCD computer-monitor which can display images in 3D without the encumberance of special glasses.

The display is a heady blend of new technology and another childhood favorite: lenticular imaging. Lenticulars are those colorful cards with finely ridged plastic over a color picture that either have a 3-D look or appear to move as you tilt the card from side to side. Those plastic ridges are actually lenses, and they focus on narrow strips of color that make up the images. Multiple images are interlaced beneath the lenses, so that your eyes build different views as your perspective changes.

Philips' innovation applies a lenticular surface to a high-resolution color LCD. The LCD screen displays tightly interleaved slices of several versions of the scene, giving that same sense of dimensional perspective. The demo at Philips Research is compelling. As you sit before the 17-inch monitor, people and objects seem to come to life. Scenes with well-lit foreground objects and a full range of texture and shadow behind the objects work best.

The other half of the equation is converting everyday 2-D images into 3-D images. Philips engineers developed an algorithm to examine each frame and determine which objects are in the foreground by virtue of their brightness, the sharpness of their edges (focus), and their depth.

( Post Comment | Visualization )

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