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Fluent Help: to whom can I ask?

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Old   May 29, 2007, 05:54
Default Fluent Help: to whom can I ask?
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laura
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I am working at uni with the new fluent. I wanted to try one extreme thing, a multiphase eulerian simulation, with a compressible phase (air). The simulation is unsteady, and at start is SUPER, I have what i wished for velocity, pressure, phase and turbulence. But then, in one place where the mesh is really simple and noting should happen, happens the tragedy, and the simulation diverged. I donīt know why, can be that the euler is stil not adapted for a compressible flow. Still, i think that that is the only solution, und that the simulation at the start is marvellous. Does anyone knows if is it possible to contact some people from Ansys? ANd, has anyone an idea for this strange behaviour? Every help would be appreciated. I can also explain why i think that the euler + compressible is the only solution for me.

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Old   May 29, 2007, 13:25
Default Re: Fluent Help: to whom can I ask?
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elizabeth
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I have the same problem. Iread something about it in the faq question: "I would do it that way:

1. solve the flow for incompressible medium, without energy equation. Set the density close to the density, that you expect at the present pressure and temperature. The solution for the flow dosn't has to be completely convergent, but the residuals should be on the way down.

2. Apply energy equation and compressibility of the gas and set the present pressure with operating condition option. You might do some iteration steps as well. Sometimes they are not necessary

3. Apply the thermal BC " Can anyone explain what does it mean set the present pressure with operating option, very simple, as I were 5 years? And what does it mean with "Apply the thermal bc?"
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