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Old   August 22, 2003, 09:50
Default Lost in the sea of CFD
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Greg
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What I looking for is a software application or package that has a pretty deep understanding of materials and interactions. What I need is a 3d visulization program that understands gas-solid interactions like absorption and saturation. I need to have the ability to use my own material properties for both the gas and the solid. For a seperate problem, it would also be nice if the software could simulate gas-elastic interatcions like filling a balloon up with helium. I still need to buy the workstation, so the software can be for any system. Currently, I'm looking at CFX-4 and 5.6, Algor professional multiphysics, and Moldflow Plastics Insight. Do you think these applications can handle the requirements? If not, or if you know of software better suited for these applications, I'd love to hear your recommendations.

Thanks for the attention span, Greg
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Old   August 25, 2003, 14:52
Default Re: Lost in the sea of CFD
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m-hack
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Dear Greg,


any commercial code will be able to calculate with your material properties. As long as you know them, and you know the physical effects to be modelled, you will also be able to calculate it in 3D - in theory. CFD codes like CFX, Star-CD, Fluent, numeca,... are able to solve problems like heat exchange or concentration effects using fluid and solid materials. I am not sure if I know what you mean with absorption and saturation when speaking about gas in interaction with a solid. What is the job of the solid when modelling saturation? While modelling saturation is a "non-beginner" task in CFD, that is even more the case when calculating the filling of a ballon. You will have to couple a structural FEM solver (probably explicit) with a CFD code. There is no single code which can do that "In code".
Hopefully that helped you. Feel free to post again.
Marc
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Old   August 25, 2003, 15:37
Default Re: Lost in the sea of CFD
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Greg
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Thanks Marc, that helped a lot. Forget the gas-solid interactions. As far as saturation goes, could i figure out how long it would take for a 2x4 to become waterlogged in a bathtub?

I'm still open for suggestions,

Greg
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Old   August 25, 2003, 16:09
Default Re: Lost in the sea of CFD
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Jim Park
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"that is even more the case when calculating the filling of a ballon. You will have to couple a structural FEM solver (probably explicit) with a CFD code. There is no single code which can do that "In code". "

I know in the early 90's that some automotive folks were using Fluent to study the inflation of automotive air bags - sort of an inelastic balloon.

In the same time frame, sola-vof, a free surface code was used to simulate the expansion of a bubble of steam into a pool of water (the hydrodynamics, not the thermodynamics). Sola-vof was developed at LANL (www.gnarly.lanl.gov).

The commercial code flow-3d was developed from sola-vof. Take a look at www.flow3d.com.

A balloon inflation could probably not be done without some careful exploitation. But it may be that one single code can do that.
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