[kaaja]

Hi,

We are using interFoam, and have problems with one of the fluids filling up our channel.
From the pictures below it looks like it is the inlet BC that creates our problem, since the inlet only contains one of the fluids.

pic1.jpg

pic2.jpg

Does anybody know how to make the inlet consist of both fluids, just as the rest of the fluids does at the first solution time period?

Here is our alpha-file

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  5                                     |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      alpha.water;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 0 0 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           $internalField;
        /*
        type            variableHeightFlowRate;
        lowerBound      0;
        upperBound      1;
        value           $internalField;*/
    }

    outlet
    {
        //type            fixedValue;
        //value           $internalField;
        type            variableHeightFlowRate;
        lowerBound      0;
        upperBound      1;
        value           $internalField;
    }

    widthSide
    {
        type            zeroGradient;
    }
    top
    {
        type            inletOutlet;
        inletValue      $internalField;
        value           $internalField;
    }
    bottom
    {
        type            zeroGradient;
    }
    cube
    {
        type            zeroGradient;
    }
    sym
    {
        type            symmetryPlane;
    }
}

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

[Taataa]

The mesh seems to be awful elongated in the direction the flow!
Regarding the BC just set the value to alpha at the inlet to a value less than 1, depending how much of the the other fluid you want to have e.g. a value of 0.5 means 50% of inflow will be the fluid.

[kaaja]

I set the value to 1, and that did the trick. Thank you so much for this precise, fast and helpfull answer!