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-   -   Steady compressible solver (http://www.cfd-online.com/Forums/openfoam-solving/78875-steady-compressible-solver.html)

smart August 4, 2010 10:34

Steady compressible solver
 
I am looking for a steady compressible solver to run supersonic flow in a nozzle. Is it possible?

Thank you very much.

Sylvain

ata August 6, 2010 09:00

rhoSimpleFoam
 
Hi Sylvain Martel
I think you can use rhoSimpleFoam.
Good luck

Ata

smart August 6, 2010 09:03

I try to use it but i cannot obtain a choked flow in a nozzle with shock wave in the divergent section. Maybe it is because of my test case.

For this reason, I would like to know if the rhosimplefoam solver is able to do this task. Thank you!

SM

kiran August 6, 2010 12:59

hi smart

can you tell me which version of OpenFoam r u using

if u use 1.5 then its better to use rhoturbFoam

or

if u use 1.6 then use sonicFoam

smart August 6, 2010 13:32

I use the OF-1.5-dev. I know that sonicFoam or rhoturbFoam can do that but these solver are for unsteady state flow. I am looking about a steady-state compressible solver like rhoSimpleFoam. I would like to know if the compressibility effect are taken into account. In fact, in my nozzle, inlet is subsonic and outlet is supersonic with a choked point at the throat.

What is the limitation of rhoSimpleFoam in regard to the compressibility effect?

SM

kiran August 6, 2010 13:50

compressiblity effect
 
when ever a flow is changing from subsonic to supersonic, then the flow is no more steady.

actually the flow is highly compressible(in your case sics you said supersonic outlet) at the outlet and you get a series of shock waves and expansion waves.

so in order to predict this you need a compressible turbulent solver.

smart August 6, 2010 14:33

However we have a transient flow behavior from subsonic to supersonic, I think that the flow can be in steady-state. Of course, the turbulent component is not steady but the mean part is.

I would like to know if I can simulate flow:
1- choked flow without shock wave (exit pressure = ambiant pressure)
2- choked flow with shock wave in divergent section (exit pressure = ambiant pressure)

SM

ata August 7, 2010 03:14

Steady compressible solver
 
Hi smart
I think may be you can use steady state scheme for time derivative in an unsteady solver an get steady state solution.
Good luck

Ata

nileshjrane August 20, 2010 07:46

Hi folks,

I am also facing same kind of dilemma, that which solver of OF 1.7 is good for a simulation of a flow having velocities ranging between M=0.3 to M=1.0..??? there are so many options available and so little in User guide about them, a newbie like me is really struggling to decide upon one solver..:confused: my friend suggested me "rhoturbFoam" but its not there in OF 1.7??? so which solver can be used instead of "rhoturbFoam"???

Please can anyone help me?? Also is there any way i can get more info on the solvers other than the user guide??


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