Steady Solver in OpenFoam

wwwjuventuscom · January 3, 2011, 08:38

Hi Everyone,

I am a new guy to OpenFoam, now I am stuck with one problem that I need your help. I use Ansys CFX and OpenFoam to solve the "backward facing step" problem, which is a laminar, steady problem. However, in OpenFoam. all the steady solvers seem to get wrong results, for example, by using potentialFoam, the velocity at the singularity point is the biggest, which is obviously not the case, so is in simpleFoam. However, by using the transient solver such as icoFoam, the results is OK, but if the meshsize is very small, the timestep must be very small which means that it costs such huge amount of time to get the steady results.

So my questions is that is there a steady solver that just takes a few iterations and then solve the problem? If so, could you please tell me which solver?If not, what should I do then?

santiagomarquezd · January 4, 2011, 15:54

May be this: http://www.amcaonline.org.ar/ojs/ind...File/3263/3186 could be useful.

Regards

julien.decharentenay · January 4, 2011, 20:01

Try simpleFoam (steady-state solver), and turn off the turbulence. It will take longer than "a few" iterations, but a lot less than the transient solver.

January 3, 2011, 08:38	Steady Solver in OpenFoam	#1
wwwjuventuscom New Member ?????? Join Date: Nov 2010 Posts: 1 Rep Power: 0	Hi Everyone, I am a new guy to OpenFoam, now I am stuck with one problem that I need your help. I use Ansys CFX and OpenFoam to solve the "backward facing step" problem, which is a laminar, steady problem. However, in OpenFoam. all the steady solvers seem to get wrong results, for example, by using potentialFoam, the velocity at the singularity point is the biggest, which is obviously not the case, so is in simpleFoam. However, by using the transient solver such as icoFoam, the results is OK, but if the meshsize is very small, the timestep must be very small which means that it costs such huge amount of time to get the steady results. So my questions is that is there a steady solver that just takes a few iterations and then solve the problem? If so, could you please tell me which solver?If not, what should I do then?

January 4, 2011, 15:54		#2
santiagomarquezd Senior Member Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 452 Rep Power: 24	May be this: http://www.amcaonline.org.ar/ojs/ind...File/3263/3186 could be useful. Regards __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar

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January 4, 2011, 20:01		#3
julien.decharentenay Senior Member Julien de Charentenay Join Date: Jun 2009 Location: Australia Posts: 231 Rep Power: 18	Try simpleFoam (steady-state solver), and turn off the turbulence. It will take longer than "a few" iterations, but a lot less than the transient solver.