dynamicContactAngle.C

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License
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#include "dynamicContactAngle.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace contactAngleModels
{
    defineTypeNameAndDebug(dynamic, 0);
    addToRunTimeSelectionTable(contactAngleModel, dynamic, dictionary);
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::contactAngleModels::dynamic::dynamic(const dictionary& dict)
:
    theta0_(dict.lookup<scalar>("theta0", units::degrees)),
    uTheta_(dict.lookup<scalar>("uTheta", dimVelocity)),
    thetaAdv_(dict.lookup<scalar>("thetaAdv", units::degrees)),
    thetaRec_(dict.lookup<scalar>("thetaRec", units::degrees))
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::contactAngleModels::dynamic::~dynamic()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::tmp<Foam::scalarField>
Foam::contactAngleModels::dynamic::cosTheta
(
    const fvPatchVectorField& Up,
    const vectorField& nHat
) const
{
    const vectorField nf(Up.patch().nf());
 
    // Calculated the component of the velocity parallel to the wall
    vectorField U(Up.patchInternalField() - Up);
    U -= (nf & U)*nf;
 
    // Find the direction of the interface parallel to the wall and normalise
    vectorField n(nHat - (nf & nHat)*nf);
    n /= (mag(n) + small);
 
    // Calculate the velocity coefficient
    // from the component of U normal to the interface
    const scalarField uCoeff(tanh((n & U)/uTheta_));
 
    return cos
    (
        theta0_
      + (thetaRec_ - theta0_)*max(uCoeff, scalar(0))
      - (thetaAdv_ - theta0_)*min(uCoeff, scalar(0))
    );
}
 
 
void Foam::contactAngleModels::dynamic::write(Ostream& os) const
{
    writeEntry(os, "theta0", units::degrees, theta0_);
    writeEntry(os, "uTheta", dimVelocity, uTheta_);
    writeEntry(os, "thetaAdv", units::degrees, thetaAdv_);
    writeEntry(os, "thetaRec", units::degrees, thetaRec_);
}
 
 
// ************************************************************************* //