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does anyone know whats type "freeStream"?

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Old   June 13, 2013, 17:08
Default does anyone know whats type "freeStream"?
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Ehsan
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what does mean freeStream or freeStreamPressure type?whats the difference to zeroGradient?
Code:
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            freestreamPressure;
    }

    outlet
    {
        type            freestreamPressure;
    }
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Old   June 21, 2013, 12:17
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I have found it in the solver's text.so its derived from inletOutlet.OK.but it has not mentioned that whats the difference between freeStream BC and inletOutletBC.
does anyone know about it?
Code:
Description
    This boundary condition provides a free-stream condition.  It is a 'mixed'
    condition derived from the \c inletOutlet condition, whereby the mode of
    operation switches between fixed (free stream) value and zero gradient
    based on the sign of the flux.
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