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Pressure convergence problems with directMapped

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Old   March 14, 2012, 08:02
Default Pressure convergence problems with directMapped
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Arve
Join Date: Sep 2011
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I am trying to simulate an infinite corrugated pipe using a single corrugation and a wedge. The solver is rhoPimpleFoam with LES Smagorinsky. The mesh is attached. checkMesh reports no errors with
Code:
Mesh non-orthogonality Max: 39.808437694 average: 4.9037417816
Max skewness = 0.5954216663 OK.
I used the pitzDailyDirectMapped setup but changed the sampleMode to nearestPatchFace. My entry in the boundary file is
Code:
    inlet
    {
        type            directMappedPatch;
        nFaces          37;
        startFace       8051;
	sampleMode	nearestPatchFace;
	samplePatch	outlet;
	offset		(0.0029 0 0);
	//sampleMode      nearestCell;
        //sampleRegion    region0;
        //samplePatch     none;
        //offsetMode      uniform;
    }
Boundary conditions:
U:
Code:
    inlet
    {
        type            directMapped;
        value           uniform (10 0 0);
	interpolationScheme cell;
	setAverage	true;
	average		(10 0 0);
    }
    outlet
    {
        type            inletOutlet;
        inletValue      uniform (0 0 0);
        value           uniform (0 0 0);
}
p:
Code:
    inlet
    {
        type            zeroGradient;
    }
    outlet
    {
        type            waveTransmissive;
        field           p;
        phi             phi;
        rho             rho;
        psi             psi;
        gamma           1.3;
        fieldInf        1e5;
        lInf            1;
        value           uniform 1e5;
    }
I found that waveTransmissive performs better than fixedValue. The problem is that the pressure never converges properly. When running the outer correctors of the PIMPLE algorithm the pressure converges either at 10 loops or never (50 max). Mostly it does not converge. I think that the pressure and the flow field across the mapped patch is the problem, but I do not know how to fix this.

Any help would be greatly appreciated.
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Old   March 15, 2012, 05:44
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Arve
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If anyone is interested in running my case for themselves, I have uploaded my whole case with mesh.

http://dl.dropbox.com/u/39254711/case.zip
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Old   March 16, 2012, 05:56
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Did you get that error with my case setup? I am running OF 2.0. The solver I am using for the pressure is GAMG, so that should not give an error.

EDIT: responded to a post here which has since been removed.

Last edited by Taltan; March 16, 2012 at 09:21.
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Old   April 27, 2012, 03:59
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Hello!

Im trying to do a multi Region sim and now I have to set Bc. It is not very clear for me what compressible::turbulentHeatFluxTemperature does and how I can change my BC so that OF don't want so cast my bc and how i can define an energy heatsource on my solid patch.

Can you help me with my problem?
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cyclic, directmapped, infinite, pipe, pressure

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