00001 /*---------------------------------------------------------------------------*\ 00002 ========= | 00003 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox 00004 \\ / O peration | 00005 \\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd. 00006 \\/ M anipulation | 00007 ------------------------------------------------------------------------------- 00008 License 00009 This file is part of OpenFOAM. 00010 00011 OpenFOAM is free software: you can redistribute it and/or modify it 00012 under the terms of the GNU General Public License as published by 00013 the Free Software Foundation, either version 3 of the License, or 00014 (at your option) any later version. 00015 00016 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT 00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 00018 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 00019 for more details. 00020 00021 You should have received a copy of the GNU General Public License 00022 along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>. 00023 00024 \*---------------------------------------------------------------------------*/ 00025 00026 #include "exponential.H" 00027 #include <OpenFOAM/addToRunTimeSelectionTable.H> 00028 00029 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * // 00030 00031 namespace Foam 00032 { 00033 namespace pdfs 00034 { 00035 defineTypeNameAndDebug(exponential, 0); 00036 addToRunTimeSelectionTable(pdf, exponential, dictionary); 00037 } 00038 } 00039 00040 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * // 00041 00042 Foam::pdfs::exponential::exponential(const dictionary& dict, Random& rndGen) 00043 : 00044 pdf(typeName, dict, rndGen), 00045 minValue_(readScalar(pdfDict_.lookup("minValue"))), 00046 maxValue_(readScalar(pdfDict_.lookup("maxValue"))), 00047 lambda_(readScalar(pdfDict_.lookup("lambda"))) 00048 { 00049 check(); 00050 } 00051 00052 00053 // * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * // 00054 00055 Foam::pdfs::exponential::~exponential() 00056 {} 00057 00058 00059 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * // 00060 00061 Foam::scalar Foam::pdfs::exponential::sample() const 00062 { 00063 scalar y = rndGen_.scalar01(); 00064 scalar K = exp(-lambda_*maxValue_) - exp(-lambda_*minValue_); 00065 return -(1.0/lambda_)*log(exp(-lambda_*minValue_) + y*K); 00066 } 00067 00068 00069 Foam::scalar Foam::pdfs::exponential::minValue() const 00070 { 00071 return minValue_; 00072 } 00073 00074 00075 Foam::scalar Foam::pdfs::exponential::maxValue() const 00076 { 00077 return maxValue_; 00078 } 00079 00080 00081 // ************************ vim: set sw=4 sts=4 et: ************************ //
