/usr/include/freefoam/lagrangianIntermediate/GradientDispersionRAS.C is in libfreefoam-dev 0.1.0+dfsg-1build1.
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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
\\/ 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 <lagrangianIntermediate/GradientDispersionRAS.H>
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
template<class CloudType>
Foam::GradientDispersionRAS<CloudType>::GradientDispersionRAS
(
const dictionary& dict,
CloudType& owner
)
:
DispersionRASModel<CloudType>(dict, owner),
gradkPtr_(NULL)
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
template<class CloudType>
Foam::GradientDispersionRAS<CloudType>::~GradientDispersionRAS()
{
cacheFields(false);
}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template<class CloudType>
bool Foam::GradientDispersionRAS<CloudType>::active() const
{
return true;
}
template<class CloudType>
void Foam::GradientDispersionRAS<CloudType>::cacheFields(const bool store)
{
DispersionRASModel<CloudType>::cacheFields(store);
if (store)
{
gradkPtr_ = fvc::grad(*this->kPtr_).ptr();
}
else
{
if (gradkPtr_)
{
delete gradkPtr_;
gradkPtr_ = NULL;
}
}
}
template<class CloudType>
Foam::vector Foam::GradientDispersionRAS<CloudType>::update
(
const scalar dt,
const label celli,
const vector& U,
const vector& Uc,
vector& UTurb,
scalar& tTurb
)
{
const scalar cps = 0.16432;
const volScalarField& k = *this->kPtr_;
const volScalarField& epsilon = *this->epsilonPtr_;
const volVectorField& gradk = *this->gradkPtr_;
const scalar UrelMag = mag(U - Uc - UTurb);
const scalar tTurbLoc = min
(
k[celli]/epsilon[celli],
cps*pow(k[celli], 1.5)/epsilon[celli]/(UrelMag + SMALL)
);
// Parcel is perturbed by the turbulence
if (dt < tTurbLoc)
{
tTurb += dt;
if (tTurb > tTurbLoc)
{
tTurb = 0.0;
scalar sigma = sqrt(2.0*k[celli]/3.0);
vector dir = -gradk[celli]/(mag(gradk[celli]) + SMALL);
// Numerical Recipes... Ch. 7. Random Numbers...
scalar x1 = 0.0;
scalar x2 = 0.0;
scalar rsq = 10.0;
while ((rsq > 1.0) || (rsq == 0.0))
{
x1 = 2.0*this->owner().rndGen().scalar01() - 1.0;
x2 = 2.0*this->owner().rndGen().scalar01() - 1.0;
rsq = x1*x1 + x2*x2;
}
scalar fac = sqrt(-2.0*log(rsq)/rsq);
// In 2D calculations the -grad(k) is always
// away from the axis of symmetry
// This creates a 'hole' in the spray and to
// prevent this we let x1 be both negative/positive
if (this->owner().mesh().nSolutionD() == 2)
{
fac *= x1;
}
else
{
fac *= mag(x1);
}
UTurb = sigma*fac*dir;
}
}
else
{
tTurb = GREAT;
UTurb = vector::zero;
}
return Uc + UTurb;
}
// ************************ vim: set sw=4 sts=4 et: ************************ //
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