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Read gradient values of constantAlphaContactAngle

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Old   November 25, 2013, 09:26
Default Read gradient values of constantAlphaContactAngle
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Hello foamers,

I want to read the values of the entry "gradient" of boundary patch. Let's say I define the BC as:

Code:
    symFluidLeft
    {
        type            constantAlphaContactAngle;
        theta0          45;
        limit           gradient;
        value           uniform 0;    
    }
I'm able to read the alpha field of the patch of type constantAlphaContactAngle. In order to do this:
Code:
const fvMesh& mesh = alpha1.mesh();
const volScalarField::GeometricBoundaryField& abf = alpha1.boundaryField();

const fvBoundaryMesh& boundary = mesh.boundary();

forAll(boundary, patchI)
{
    if(abf[patchI].type() == "constantAlphaContactAngle")
    {
        Info << "Alpha value of face 1 of patchI" << abf[patchI][0] << endl;
    }
}
But how can I read the gradient values of this patch, which are stored in the GeometricBoundaryField abf, too?
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