[vmsandip2011]

I want to run the potentialFoam with few iterations and then run the simpleFoam using the same controlDict and fvSolution files , what changes are needed for openFoam2.1.0
Is it necessay to specify the residual controls in fvSolution file for simpleFoam?
Idea is to use results of potentialFoam for simpleFoam as initial conditions.

with regards.

[openfoam_user]

Hi,

have a look at the motorbike tutorial. Exactly what you want (potentialFoam and then simpleFoam).

~/OpenFOAM/OpenFOAM-2.1.x/tutorials/incompressible/simpleFoam/motorBike

Regards,
Stephane.

[macRC]

Dear Foamers,

I exactly wanted to do the same, first initializing with potentialfoam and then running the simulation with simplefoam.

I compared the residuals and results with AND without initialization, BUT there is no difference at all. What could be wrong?

My workflow is to create a single mesh, after that decomposepar it, run potentialfoam parallel, run simplefoam in parallel and reconstruct it again in the end.

thanks a lot

[Sune]

Is this what you want?

Initialization with potentialFoam

[MathiasSonderskov]

Originally Posted by macRC

Dear Foamers,

I exactly wanted to do the same, first initializing with potentialfoam and then running the simulation with simplefoam.

I compared the residuals and results with AND without initialization, BUT there is no difference at all. What could be wrong?

My workflow is to create a single mesh, after that decomposepar it, run potentialfoam parallel, run simplefoam in parallel and reconstruct it again in the end.

thanks a lot

What's the advantage of initializing with potentialFoam before simpleFoam?

[petros]

potentialFoam solves only for the velocity potential.

There are times when you are not entirely sure about the initial conditions of your problem. Running potentialFoam prior to more advanced solvers can help you initialise your simulation with "better" initial conditions, which can reduce the computational cost.

Petros

[MathiasSonderskov]

Originally Posted by petros

potentialFoam solves only for the velocity potential.

There are times when you are not entirely sure about the initial conditions of your problem. Running potentialFoam prior to more advanced solvers can help you initialise your simulation with "better" initial conditions, which can reduce the computational cost.

Petros

Thanks very much.
So you would have a controldict saying let's say 200 iterations for potentialfoam before running 2000 in simpleFoam.

Would one have to save them as controlDict.potentialFoam and controlDict.simpleFoam then or what's best practice?
And in a bat script you'll just run one solver after the other, correct?

[petros]

As far as I am concerned, you don't have to set up different controlDicts. You just need to modify your fvSolution file to include something like:

 
potentialFlow
{
    nNonOrthogonalCorrectors 3;
}

For a complete set up, please have a look at the windAroundBuildings tutorial case.
https://github.com/OpenFOAM/OpenFOAM...roundBuildings

[granzer]

Originally Posted by petros

As far as I am concerned, you don't have to set up different controlDicts. You just need to modify your fvSolution file to include something like:

 
potentialFlow
{
    nNonOrthogonalCorrectors 3;
}

For a complete set up, please have a look at the windAroundBuildings tutorial case.
https://github.com/OpenFOAM/OpenFOAM...roundBuildings

Does this mean that potentialFoam solver will run for 3 iterations and then simpleFoam will take over for the number of iterations mentioned in controlDict?

[petros]

That's correct.

[granzer]

Originally Posted by petros

That's correct.

Thank you @petros. But here it says potentialFoam runs just one iteration with n (here n=3) corrector loops. potentialFoam not writing and only one iteration

[petros]

Yes but non-orthogonal corrector loops are also iterations. potentialFoam does not contain any time loop - it just iterates over the user-specified non-orthogonal velocity potential corrector loops.