54 lines
1.9 KiB
C
54 lines
1.9 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) 2016 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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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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//Amplitude Mapping Closure (from KIVA)
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//Define exp(-2*(erf^-1(2*eta - 1))^2)
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inline Foam::scalar Foam::CMC::AMC(const scalar eta)
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{
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const scalar a0 = (2.0*eta - 1.0);
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scalar a1 = 0.5;
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scalar slope;
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scalar da = GREAT;
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while(mag(da) > SMALL)
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{
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slope = (2.0/spi)*Foam::exp(-1.0*Foam::pow(a1,2.0));
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da = (a0 - Foam::erf(a1))/slope;
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a1 = a1 + da;
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}
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return Foam::exp(-2.0*Foam::pow(a1,2.0));
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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// ************************************************************************* //
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