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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 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 "fft.H"
#include "turbGen.H"
#include "Kmesh.H"
#include "primitiveFields.H"
#include "Ek.H"
#include "mathematicalConstants.H"
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::turbGen::turbGen(const Kmesh& k, const scalar EA, const scalar K0)
:
K_(k),
Ea_(EA),
k0_(K0),
rndGen_(label(0))
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
Foam::vectorField Foam::turbGen::U()
{
const vectorField& K(K_);
vectorField s(K.size());
scalarField rndPhases(K.size());
forAll(K, i)
{
s[i] = rndGen_.sample01<vector>();
rndPhases[i] = rndGen_.scalar01();
}
s = K ^ s;
s = s/(mag(s) + 1.0e-20);
s = Ek(Ea_, k0_, mag(K))*s;
complexVectorField up
(
fft::reverseTransform
(
ComplexField
(
eval(cos(constant::mathematical::twoPi*rndPhases)*s),
eval(sin(constant::mathematical::twoPi*rndPhases)*s)
),
K_.nn()
)
);
return ReImSum(up);
}
// ************************************************************************* //
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