68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*---------------------------------------------------------------------------*\
|
|
========= |
|
|
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
|
|
\\ / O peration |
|
|
\\ / A nd | Copyright (C) 2016 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 "AMC.H"
|
|
|
|
#include "error.H"
|
|
|
|
// * * * * * * * * * * * * * Functions * * * * * * * * * * * * //
|
|
|
|
//Amplitude Mapping Closure (from KIVA)
|
|
//Define exp(-2*(erf^-1(2*eta - 1))^2)
|
|
inline Foam::scalar Foam::CMC::AMC(const scalar eta)
|
|
{
|
|
const scalar a0 = (2.0*eta - 1.0);
|
|
scalar a1 = 0.5;
|
|
scalar slope;
|
|
scalar da = GREAT;
|
|
|
|
while(mag(da) > SMALL)
|
|
{
|
|
slope = (2.0/spi)*Foam::exp(-1.0*Foam::pow(a1,2.0));
|
|
da = (a0 - Foam::erf(a1))/slope;
|
|
a1 = a1 + da;
|
|
}
|
|
|
|
return Foam::exp(-2.0*Foam::pow(a1,2.0));
|
|
}
|
|
|
|
//Amplitude Mapping Closure (from KIVA)
|
|
Foam::tmp<Foam::scalarField> Foam::CMC::AMC(const scalarField& eta)
|
|
{
|
|
tmp<scalarField> tRes(new scalarField(eta.size(), 0.0));
|
|
|
|
scalarField& Res = tRes.ref();
|
|
|
|
for(label i=0 ; i<eta.size() ; i++)
|
|
{
|
|
Res[i] = AMC(eta[i]);
|
|
}
|
|
|
|
return tRes;
|
|
}
|
|
|
|
|
|
|
|
// ************************************************************************* //
|