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-   -   compressible and incompressible flow (http://www.cfd-online.com/Forums/fluent/49738-compressible-incompressible-flow.html)

chinababu November 8, 2008 01:39

compressible and incompressible flow
 
i am trying to solve one problem having both compressible (air-ideal gas) and incompressible (water) fluids and the solution is not converging but when we have taken both the fluids (air &water) as incompressible fluids, the solution is converging. Can you tell what the problem in giving conditions was and how to handle the problem if we are having compressible and incompressible fluids using simultaneously?

mahi November 8, 2008 05:52

Re: compressible and incompressible flow
 
You can try a density based solver. I think you are using a pressure based solver

peterliu November 9, 2008 01:36

Re: compressible and incompressible flow
 
what do your boundary conditions for your outlet ? try to use pressure out-let.

Amod@Siemens November 11, 2008 13:16

Re: compressible and incompressible flow
 
So long MAch number for air (the compressible) media is < 0.3, you can always treat it Incompressible without loss of acccuracy!

What phenomena (application) are you trying to solve!

mahi November 13, 2008 06:56

Re: compressible and incompressible flow
 
Dude, try a pressure based coupled solver. It might work in your case. Give air as compressible and water as incompressible phases


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