Steadystate pressurebased compressible solver

cosimobianchini · November 7, 2006, 11:18

Hi all,
I'm looking for suggestions on an extension to all-speed flows of my old weakly compressible solver.
It is a pressure-based steady-state solver using the SIMPLE algorithm and in the weakly compressible version works fine.
As suggested by many authors, to extend this solver to high-Mach flows, I only added a convective term (function of Ma) to the original Poisson-type pressure correction equation.
The problem is:

in the steady-state form, calculations go wrong after few iterations even in subsonic one-dimensional cases.

I think it is due to the ill-conditioned matrix of the pressure correction equation.

Is there anyone that has already solved this problem?
Can you please give me any ideas on how to improve convergence properties in such a case?

Thank you in advance for your help

Cosimo

smart · July 19, 2010, 14:45

Hello, I am trying to work out a compressible steady-state calculation using openfoam. Do you succeed with your SIMPLE application?

For now, I am trying rhosimplefoam without a lot of success. In fact, I want to calculate supersonic flow with steady-state solver like SIMPLE. Could you, please, give me some information about your case and what was the results?

Thank you very much,

Sylvain

November 7, 2006, 11:18	Hi all, I'm looking for sugg	#1
cosimobianchini Member cosimo bianchini Join Date: Mar 2009 Location: Florence, Tuscany, Italy Posts: 88 Rep Power: 17	Hi all, I'm looking for suggestions on an extension to all-speed flows of my old weakly compressible solver. It is a pressure-based steady-state solver using the SIMPLE algorithm and in the weakly compressible version works fine. As suggested by many authors, to extend this solver to high-Mach flows, I only added a convective term (function of Ma) to the original Poisson-type pressure correction equation. The problem is: in the steady-state form, calculations go wrong after few iterations even in subsonic one-dimensional cases. I think it is due to the ill-conditioned matrix of the pressure correction equation. Is there anyone that has already solved this problem? Can you please give me any ideas on how to improve convergence properties in such a case? Thank you in advance for your help Cosimo __________________ Cosimo Bianchini Ergon Research s.r.l. Via Panciatichi, 92 50127 Florence - ITALY Tel: +39 055 0763716 Mob: +39 320 9460153 e-mail: cosimo.bianchini@ergonresearch.it URL: www.ergonresearch.it

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July 19, 2010, 14:45		#2
smart Member Sylvain Martel Join Date: Apr 2009 Location: University of Sherbrooke/Quebec/Canada Posts: 51 Rep Power: 17	Hello, I am trying to work out a compressible steady-state calculation using openfoam. Do you succeed with your SIMPLE application? For now, I am trying rhosimplefoam without a lot of success. In fact, I want to calculate supersonic flow with steady-state solver like SIMPLE. Could you, please, give me some information about your case and what was the results? Thank you very much, Sylvain