UOprocess.C

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    Copyright (C) 2011-2017 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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#include "error.H"
 
#include "UOprocess.H"
#include "Kmesh.H"
#include "dictionary.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
complexVector UOprocess::WeinerProcess()
{
    return RootDeltaT*complexVector
    (
        complex(GaussGen.GaussNormal<scalar>(), GaussGen.GaussNormal<scalar>()),
        complex(GaussGen.GaussNormal<scalar>(), GaussGen.GaussNormal<scalar>()),
        complex(GaussGen.GaussNormal<scalar>(), GaussGen.GaussNormal<scalar>())
    );
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
UOprocess::UOprocess
(
    const Kmesh& kmesh,
    const scalar deltaT,
    const dictionary& UOdict
)
:
    GaussGen(),
    Mesh(kmesh),
    DeltaT(deltaT),
    RootDeltaT(sqrt(DeltaT)),
    UOfield(Mesh.size()),
 
    Alpha(UOdict.get<scalar>("UOalpha")),
    Sigma(UOdict.get<scalar>("UOsigma")),
    Kupper(UOdict.get<scalar>("UOKupper")),
    Klower(UOdict.get<scalar>("UOKlower")),
    Scale((Kupper - Klower)*pow(scalar(Mesh.size()), 1.0/vector::dim))
{
    const vectorField& K = Mesh;
 
    scalar sqrKupper = sqr(Kupper);
    scalar sqrKlower = sqr(Klower) + SMALL;
    scalar sqrK;
 
    forAll(UOfield, i)
    {
        if ((sqrK = magSqr(K[i])) < sqrKupper && sqrK > sqrKlower)
        {
            UOfield[i] = Scale*Sigma*WeinerProcess();
        }
        else
        {
            UOfield[i] = complexVector::zero;
        }
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
const complexVectorField& UOprocess::newField()
{
    const vectorField& K = Mesh;
 
    label count = 0;
    scalar sqrKupper = sqr(Kupper);
    scalar sqrKlower = sqr(Klower) + SMALL;
    scalar sqrK;
 
    forAll(UOfield, i)
    {
        if ((sqrK = magSqr(K[i])) < sqrKupper && sqrK > sqrKlower)
        {
            count++;
            UOfield[i] =
                (1.0 - Alpha*DeltaT)*UOfield[i]
              + Scale*Sigma*WeinerProcess();
        }
    }
 
    Info<< "    Number of forced K = " << count << nl;
 
    return UOfield;
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// ************************************************************************* //