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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2024 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "OUprocess.H"
#include "Kmesh.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
complexVector OUprocess::WeinerProcess(const scalar deltaT) const
{
return sqrt(deltaT)*complexVector
(
complex(stdNormal_.sample(), stdNormal_.sample()),
complex(stdNormal_.sample(), stdNormal_.sample()),
complex(stdNormal_.sample(), stdNormal_.sample())
);
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
OUprocess::OUprocess
(
const Kmesh& kmesh,
const scalar deltaT,
const dictionary& OUdict
)
:
stdNormal_(0),
Kmesh_(kmesh),
OUfield_(Kmesh_.size()),
alpha_(OUdict.lookup<scalar>("alpha")),
sigma_(OUdict.lookup<scalar>("sigma")),
kUpper_(OUdict.lookup<scalar>("kUpper")),
kLower_(OUdict.lookup<scalar>("kLower")),
scale_((kUpper_ - kLower_)*pow(scalar(Kmesh_.size()), 1.0/vector::dim))
{
const vectorField& K = Kmesh_;
scalar sqrkUpper_ = sqr(kUpper_);
scalar sqrkLower_ = sqr(kLower_) + small;
scalar sqrK;
forAll(OUfield_, i)
{
if ((sqrK = magSqr(K[i])) < sqrkUpper_ && sqrK > sqrkLower_)
{
OUfield_[i] = scale_*sigma_*WeinerProcess(deltaT);
}
else
{
OUfield_[i] = complexVector
(
complex(0, 0),
complex(0, 0),
complex(0, 0)
);
}
}
}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
const complexVectorField& OUprocess::newField(const scalar deltaT) const
{
const vectorField& K = Kmesh_;
scalar sqrkUpper_ = sqr(kUpper_);
scalar sqrkLower_ = sqr(kLower_) + small;
scalar sqrK;
forAll(OUfield_, i)
{
if ((sqrK = magSqr(K[i])) < sqrkUpper_ && sqrK > sqrkLower_)
{
OUfield_[i] =
(1.0 - alpha_*deltaT)*OUfield_[i]
+ scale_*sigma_*WeinerProcess(deltaT);
}
}
return OUfield_;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// ************************************************************************* //
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