aaa3d026e8
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1650 Thanks to Timo Niemi
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2015 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "StochasticDispersionRAS.H"
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#include "constants.H"
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using namespace Foam::constant::mathematical;
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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template<class CloudType>
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Foam::StochasticDispersionRAS<CloudType>::StochasticDispersionRAS
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(
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const dictionary& dict,
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CloudType& owner
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)
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:
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DispersionRASModel<CloudType>(dict, owner)
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{}
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template<class CloudType>
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Foam::StochasticDispersionRAS<CloudType>::StochasticDispersionRAS
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(
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const StochasticDispersionRAS<CloudType>& dm
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)
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:
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DispersionRASModel<CloudType>(dm)
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{}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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template<class CloudType>
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Foam::StochasticDispersionRAS<CloudType>::~StochasticDispersionRAS()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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template<class CloudType>
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Foam::vector Foam::StochasticDispersionRAS<CloudType>::update
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(
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const scalar dt,
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const label cellI,
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const vector& U,
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const vector& Uc,
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vector& UTurb,
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scalar& tTurb
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)
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{
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cachedRandom& rnd = this->owner().rndGen();
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const scalar cps = 0.16432;
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const scalar k = this->kPtr_->internalField()[cellI];
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const scalar epsilon =
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this->epsilonPtr_->internalField()[cellI] + ROOTVSMALL;
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const scalar UrelMag = mag(U - Uc - UTurb);
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const scalar tTurbLoc =
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min(k/epsilon, cps*pow(k, 1.5)/epsilon/(UrelMag + SMALL));
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// Parcel is perturbed by the turbulence
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if (dt < tTurbLoc)
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{
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tTurb += dt;
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if (tTurb > tTurbLoc)
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{
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tTurb = 0;
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const scalar sigma = sqrt(2*k/3.0);
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// Calculate a random direction dir distributed uniformly
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// in spherical coordinates
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const scalar theta = rnd.sample01<scalar>()*twoPi;
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const scalar u = 2*rnd.sample01<scalar>() - 1;
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const scalar a = sqrt(1 - sqr(u));
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const vector dir(a*cos(theta), a*sin(theta), u);
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UTurb = sigma*mag(rnd.GaussNormal<scalar>())*dir;
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}
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}
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else
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{
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tTurb = GREAT;
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UTurb = vector::zero;
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}
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return Uc + UTurb;
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}
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// ************************************************************************* //
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