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pressure initialization

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Old   January 1, 2016, 14:38
Default pressure initialization
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hossein hadi
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Dear Foamers,

I'm simulating fluid flow and heat transfer in a channel using buoyantBuossinesqSimpleFoam.

In normal geometry everything is OK, but when i use a converging channel geometry the calculations will not converge.

Actually the pressure starts with a very high value (about 3 bar, when I expect the converged pressure at inlet to be about 3kPa !!). So it takes a lot of time to decrease.

My pressure conditions are:
Code:
internalField   uniform 0;

boundaryField
{
    heatingWalls
    {
        type            zeroGradient;
    }

    topWall
    {
        type            zeroGradient;
    }

    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            fixedValue;
        value           uniform 0;
    }
}
Please someone tell me how can I initialize pressure at inlet. (velocity is fixed at inlet)

Thanks a lot
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Old   January 3, 2016, 23:31
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nasir musa yakubu
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hello,

i would recommend you check out the following links:

http://www.cfd-online.com/Forums/ope...plication.html

http://www.cfd-online.com/Forums/ope...letoutlet.html

best regards
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