[velikaDjoka]

Hello everybody,

I am trying to do a pressure derived flow in a quenching chamber working at 5 bars. With the following geometry.

case.jpg

The tubes are the inlets and the blue circle at the back is the outlet.
Obviously I want to have a flow perpendicular to the inlet patches . To assure this I wrote the boundary conditions for the velocity : pressureNormalInletOutletVelocity.

But how come my results of the velocity field are all parallel to the X axis ?
vectors.jpg

And how the U magnitude is not the same for the bottom inlets ? This might be because I am imposing p_rgh ( so there is some gravitational effect that enters. But then how can I impose a same inlet velocity for all the inlets with a pressure driven flow? ( I am using chtMultiRegionFoam, I don't know if it is important to mention )


Does any body know how to get the flow I want to have. That is a flow coming from the inlet patches ( perpendicularly ) and a flow leaving the chamber through the outlet. With a pressure driven flow.


Here are my boundary conditions are the following for p_rgh and U:

p_rgh

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2012                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0/vaccum";
    object      p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [ 1 -1 -2 0 0 0 0 ];

internalField   uniform 500000;

boundaryField
{
    outlet
    {
        type            prghTotalPressure;
        value           uniform 499900;
        p0              uniform 499900;
    }
    walls
    {
        type            fixedFluxPressure;
        value           $internalField;
    }
    inletN
    {
        type            prghTotalPressure;
        value           uniform 500050;
        p0              uniform 500050;
    }
    inletNE
    {
        type            prghTotalPressure;
        value           uniform 500050;
        p0              uniform 500050;
    }
    inletSE
    {
        type            prghTotalPressure;
        value           uniform 500050;
        p0              uniform 500050;
    }
    inletS
    {
        type            prghTotalPressure;
        value           uniform 500050;
        p0              uniform 500050;
    }
    inletSW
    {
        type            prghTotalPressure;
        value           uniform 500050;
        p0              uniform 500050;
    }
    inletNW
    {
        type            prghTotalPressure;
        value           uniform 500050;
        p0              uniform 500050;
    }
    vaccum_to_block
    {
        type            fixedFluxPressure;
        value           $internalField;
    }
}


// ************************************************************************* //

U

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2012                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    location    "0/vaccum";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [ 0 1 -1 0 0 0 0 ];

internalField   uniform ( 0 0 0 );

boundaryField
{
    outlet
    {
        type            pressureNormalInletOutletVelocity;
        value           uniform ( 0 0 0 );
    }
    walls
    {
        type            noSlip;
        value           uniform ( 0.01 0 0 );
    }
    inletN
    {
        type            pressureNormalInletOutletVelocity;
        value           uniform ( 0 0 0 );
    }
    inletNE
    {
        type            pressureNormalInletOutletVelocity;
        value           uniform ( 0 0 0 );
    }
    inletSE
    {
        type            pressureNormalInletOutletVelocity;
        value           uniform ( 0 0 0 );
    }
    inletS
    {
        type            pressureNormalInletOutletVelocity;
        value           uniform ( 0 0 0 );
    }
    inletSW
    {
        type            pressureNormalInletOutletVelocity;
        value           uniform ( 0 0 0 );
    }
    inletNW
    {
        type            pressureNormalInletOutletVelocity;
        value           uniform ( 0 0 0 );
    }
    vaccum_to_block
    {
        type            noSlip;
        value           uniform ( 0 0 0 );
    }
}


// ************************************************************************* //

[velikaDjoka]

Problem solved normally!