CFD Online Discussion Forums - pressure initialization

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
hoseinhd