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-   -   Question about BC of pitzDaily (http://www.cfd-online.com/Forums/openfoam/79610-question-about-bc-pitzdaily.html)

maysmech August 28, 2010 13:10

Question about BC of pitzDaily
 
Dear Foamers,

This is U from pisoFoam/les/pitzDaily/0:


Code:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                |                                                |
| \\      /  F ield        | OpenFOAM: The Open Source CFD Toolbox          |
|  \\    /  O peration    | Version:  1.7.0                                |
|  \\  /    A nd          | Web:      www.OpenFOAM.com                      |
|    \\/    M anipulation  |                                                |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version    2.0;
    format      ascii;
    class      volVectorField;
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField  uniform (0 0 0);

boundaryField
{
    inlet         
    {
        type            turbulentInlet;
        referenceField  uniform (10 0 0);
        fluctuationScale (0.02 0.01 0.01);
        value          uniform (10 0 0);
    }

    outlet         
    {
        type            inletOutlet;
        inletValue      uniform (0 0 0);
        value          uniform (0 0 0);
    }

    upperWall     
    {
        type            fixedValue;
        value          uniform (0 0 0);
    }

    lowerWall     
    {
        type            fixedValue;
        value          uniform (0 0 0);
    }

    frontAndBack   
    {
        type            empty;
    }
}

as it shows initial velocity is 0 for all domain. but, i can't understand boundary values for inlet and outlet of geometry:

Code:

inlet         
    {
        type            turbulentInlet;
        referenceField  uniform (10 0 0);
        fluctuationScale (0.02 0.01 0.01);
        value          uniform (10 0 0);
    }

    outlet         
    {
        type            inletOutlet;
        inletValue      uniform (0 0 0);
        value          uniform (0 0 0);

why outlet value is zero and is it possible?
what is difference between inletValue and value in outlet?
what is the terms in inlet and their detail definition?

Regards,
Maysam


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