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Old   August 28, 2010, 13:10
Lightbulb Question about BC of pitzDaily
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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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