dynamicContactAngleForce.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
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    Copyright (C) 2020-2025 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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    under the terms of the GNU General Public License as published by
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "dynamicContactAngleForce.H"
#include "Function1.H"
#include "distributionModel.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace regionModels
{
namespace areaSurfaceFilmModels
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(dynamicContactAngleForce, 0);
addToRunTimeSelectionTable
(
    force,
    dynamicContactAngleForce,
    dictionary
);
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
dynamicContactAngleForce::dynamicContactAngleForce
(
    liquidFilmBase& film,
    const dictionary& dict
)
:
    contactAngleForce(typeName, film, dict),
    thetaPtr_(nullptr),
    U_vs_thetaPtr_
    (
        Function1<scalar>::NewIfPresent
        (
            "Utheta",
            coeffDict_,
            word::null,
            &film.primaryMesh()
        )
    ),
    T_vs_thetaPtr_
    (
        Function1<scalar>::NewIfPresent
        (
            "Ttheta",
            coeffDict_,
            word::null,
            &film.primaryMesh()
        )
    ),
    rndGen_(label(0)),
    distributionPtr_(nullptr)
{
    if (U_vs_thetaPtr_ && T_vs_thetaPtr_)
    {
        FatalIOErrorInFunction(dict)
            << "Only one of Utheta or Ttheta should be provided; "
            << "both inputs cannot be used together."
            << abort(FatalIOError);
    }
 
 
    thetaPtr_.emplace
    (
        IOobject
        (
            IOobject::scopedName(typeName, "theta"),
            film.regionMesh().time().timeName(),
            film.regionMesh().thisDb(),
            IOobject::READ_IF_PRESENT,
            IOobject::AUTO_WRITE
        ),
        film.regionMesh(),
        dimensionedScalar(dimless, Zero)
    );
 
 
    if (coeffDict_.findEntry("distribution"))
    {
        distributionPtr_ = distributionModel::New
        (
            coeffDict_.subDict("distribution"),
            rndGen_
        );
    }
}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
dynamicContactAngleForce::~dynamicContactAngleForce()
{}  // distributionModel was forward declared
 
 
// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
tmp<areaScalarField> dynamicContactAngleForce::theta() const
{
    areaScalarField& theta = thetaPtr_.ref();
    scalarField& thetai = theta.ref();
 
    if (U_vs_thetaPtr_)
    {
        // Initialize with the function of film speed
        const areaVectorField& U = film().Uf();
 
        thetai = U_vs_thetaPtr_->value(mag(U()));
    }
 
    if (T_vs_thetaPtr_)
    {
        // Initialize with the function of film temperature
        const areaScalarField& T = film().Tf();
 
        thetai = T_vs_thetaPtr_->value(T());
    }
 
    if (distributionPtr_)
    {
        // Add the stochastic perturbation
        forAll(thetai, facei)
        {
            thetai[facei] += distributionPtr_->sample();
        }
    }
 
    return thetaPtr_();
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace surfaceFilmModels
} // End namespace regionModels
} // End namespace Foam
 
// ************************************************************************* //