/usr/include/freefoam/dsmc/MixedDiffuseSpecular.C is in libfreefoam-dev 0.1.0+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | /*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2009-2010 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 "MixedDiffuseSpecular.H"
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
template <class CloudType>
Foam::MixedDiffuseSpecular<CloudType>::MixedDiffuseSpecular
(
const dictionary& dict,
CloudType& cloud
)
:
WallInteractionModel<CloudType>(dict, cloud, typeName),
diffuseFraction_(readScalar(this->coeffDict().lookup("diffuseFraction")))
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
template <class CloudType>
Foam::MixedDiffuseSpecular<CloudType>::~MixedDiffuseSpecular()
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template <class CloudType>
void Foam::MixedDiffuseSpecular<CloudType>::correct
(
const wallPolyPatch& wpp,
const label faceId,
vector& U,
scalar& Ei,
label typeId
)
{
label wppIndex = wpp.index();
label wppLocalFace = wpp.whichFace(faceId);
vector nw = wpp.faceAreas()[wppLocalFace];
// Normal unit vector
nw /= mag(nw);
// Normal velocity magnitude
scalar U_dot_nw = U & nw;
CloudType& cloud(this->owner());
Random& rndGen(cloud.rndGen());
if (diffuseFraction_ > rndGen.scalar01())
{
// Diffuse reflection
// Wall tangential velocity (flow direction)
vector Ut = U - U_dot_nw*nw;
while (mag(Ut) < SMALL)
{
// If the incident velocity is parallel to the face normal, no
// tangential direction can be chosen. Add a perturbation to the
// incoming velocity and recalculate.
U = vector
(
U.x()*(0.8 + 0.2*rndGen.scalar01()),
U.y()*(0.8 + 0.2*rndGen.scalar01()),
U.z()*(0.8 + 0.2*rndGen.scalar01())
);
U_dot_nw = U & nw;
Ut = U - U_dot_nw*nw;
}
// Wall tangential unit vector
vector tw1 = Ut/mag(Ut);
// Other tangential unit vector
vector tw2 = nw^tw1;
scalar T = cloud.boundaryT().boundaryField()[wppIndex][wppLocalFace];
scalar mass = cloud.constProps(typeId).mass();
scalar iDof = cloud.constProps(typeId).internalDegreesOfFreedom();
U =
sqrt(CloudType::kb*T/mass)
*(
rndGen.GaussNormal()*tw1
+ rndGen.GaussNormal()*tw2
- sqrt(-2.0*log(max(1 - rndGen.scalar01(), VSMALL)))*nw
);
U += cloud.boundaryU().boundaryField()[wppIndex][wppLocalFace];
Ei = cloud.equipartitionInternalEnergy(T, iDof);
}
else
{
// Specular reflection
if (U_dot_nw > 0.0)
{
U -= 2.0*U_dot_nw*nw;
}
}
}
// ************************************************************************* //
|