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Application: Combustion Research Using CFD
Posted Wed July 18, 2001 @04:28PM
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Application This NCSA article describes work being done at the State University of New York at Buffalo on combustion research. Aerospace engineer Cyrus Madnia is using Direct Numerical Simulation (DNS) to accurately predict the vortex structures within flames.

The article details the various turbulent structures used to stabilize flames and how they affect burning efficiency. The work is being done on a 16 cpu SGI Origin2000.

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CFD as a CAD Plug-in Anyone?
Posted Tue July 17, 2001 @01:30PM
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News German software developer NIKA has released [pdf] FloWorks 2001, a fluid analysis program for design engineers which works within SolidWorks.

The site claims that the software belongs to a new class of simulation software called Engineering Fluid Dynamics (EFD). Boasting complete CAD integration and engineering goal-oriented operation, the software requires less than 1 day of training to use.

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Application: CFD Improves Inkjet Printing
Posted Tue July 17, 2001 @08:40AM
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Application ME Magazine is running an article on Kodak's use of CFD in the development of a MEMS (microelectromechanical system) inkjet printhead.

Current inkjet technology (piezoelectric channel or thermal bubble) limits the overall size of the inkjet array. This makes the technology acceptable for home use, but insufficient for high production office use. Kodak hopes to use MEMS technology to produce a new method of creating inkjet drops which will scale to large arrays.

"The MEMS structures we are developing will control the motion of ink by exploiting its surface properties," Delametter explained. "Heating a fluid meniscus non-uniformly induces a gradient in surface tension. This produces a tangential force, called a Marangoni force, on the liquid free surface. Whenever fluid dimensions are less than 10 microns, thermocapillary-driven forces can separate discrete droplets from the main fluid body and also propel them rapidly through space."

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Application: Benetton Formula 1 Using CFD to Design Cars
Posted Sat July 14, 2001 @04:56PM
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Application Benetton Formula 1 has begun using CFD for whole-car analysis of their race vehicle. As one of the few teams using CFD for the whole car, Benetton is stepping away from the status quo of using panel method codes for whole-car aerodynamic analysis.

There is a short story about the effort on the CD adapco Group site. They are actually only analyzing half the car, understandable as the grid is still 10 million cells.

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Question: Are Local Timestep Methods Bad?
Posted Thu July 12, 2001 @09:00AM
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Help Desk I've often wondered about the validity of attaining a steady-state solution with local time-stepping methods (aka CFL number). The problem to me seems that slowing the problem down in one area opposed to another would not yield a global steady-state solution - unless the simulation was run for a very long time even after the residuals have "converged". The residuals are small because the solution is balanced, but the transient processes are not necessarily in balance!

I know these methods are necessary and very useful for cases which have a large (several orders of magnitude) timescale variation, such as jets expanding into quiescent flow, but are the solutions really correct?

( Read Full Article )

SGI Announces Flat Screen Display for Technical Professionals
Posted Thu July 12, 2001 @08:34AM
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Hardware SGI is breaking new ground with their line of critically acclaimed flat panel displays. The latest is the F180 Flat Panel Display which boasts an 18.1-inch display with 1280x1024 resolution.

An excerpt from the press release:

The new Silicon Graphics F180 display uses Advanced In-Plane Switching (AIPS) technology in the LCD, which yields higher brightness, increased contrast and wider color gamut than previously available on comparable LCD displays. This leading-edge technology enables more accurate image representation and crisper display for advanced graphics applications such as manufacturing, medical imaging, animation and simulation.
I've seen the older 1600SW Flat Panel and the images are beautiful. The problem I have with digital displays is their inherent "native" resolution and the fact that image quality is poor if you run them at some other resolution. The unit will be available at the end of July and carry a list price of $1,495US.

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