thank you very much
 

thank you very much

I know SimpleFoam allows stead
 

I know SimpleFoam allows steady state calculation. What do you want to simulate?

i want to simulate the most si
 

i want to simulate the most simple case "


"laminar lid driven cavity"

thank you very much,

Use simpleFoam, switching off
 

Use simpleFoam, switching off turbulence and choosing "laminar" as turbulence model.

Good work,
Alberto

In icoFoam is already the lid
 

In icoFoam is already the lid driven cavity implemented as example/tutorial case. And you
don't have any unnecessary turbulence models.
Furthermore take a look into the UserGuide, it describes the cavity case very comprehensive.

-marcus

but how to simulate a steady p
 

but how to simulate a steady problem use the icofoam solver.

i have tried a very large time step with the implicit EULER scheme, but i always divergence.

but the implicit scheme shold convenge at any time step

icoFoam uses the PISO pressure
 

icoFoam uses the PISO pressure-velocity coupling algorithm which is an efficient semi-implicit method for transient simulations but is not stable for very large time steps. This is not a proablem because very large time steps are not appropriate for transient flows.

simpleFoam is for steady-state flows and used the SIMPLE pressure-velocity algorithm which is efficient for this purpose.

If you insist on using a transient solver for steady-state flows you will have to write one using the transient SIMPLE algorithm which effectively means substituting the SIMPLE algorithm from simpleFoam into the time loop of icoFoam and introduce a convergence criterion. Although this will be stable for very large time-steps it is not an efficient way to solve steady-state problems.

What would be the best way to
 

What would be the best way to get to a compressible steady solver? sonicTurbFoam needs very small time steps, thus a rather large number of them to get to a steady state solution. How difficult is it likely to be to implement a form of local time stepping?

rhoSimpleFoam can be used for
 

rhoSimpleFoam can be used for sub-sonic compressible steady flows but for super-sonic cases under-relaxation is problematic and local time stepping may be a better option. We are investigating this at the moment.

Does anybody have some example
 

Does anybody have some example setup files for rhoSimpleFoam?

Hi Henry, did you mean rhoS
 

Hi Henry,

did you mean rhoSonicFoam by "rhoSimpleFoam" ?

and what did you mean for super-sonic cases?
did you mean for super-sonic compressible steady flows, "rhoSimpleFoam" can also be used by local time stepping as a better option, rather than sonicFoam, which is but a transient solver?

Hi everyone! Could anyone t
 

Hi everyone!

Could anyone teach me the physical meaning of
- fvm::Sp(fvc::div(phi), U)
in UEqn.H, and
fvc::div(phi/fvc::interpolate(rho)*fvc::interpolate(p))
- p*fvc::div(phi/fvc::interpolate(rho))
in hEqn.H of rhoSimpeFoam.

Thank you.

Hi all,

I am also interested in implementation of local time stepping. Even though its a very very old post, i hope you people will reply.

Can you suggest me some guideline to implement local time stepping for "rhoSonicFoam" OpenFOAM 1.6 solver.

thanks
mecbe