/usr/include/palabos/latticeBoltzmann/entropicLbTemplates.h is in libplb-dev 1.5~r1+repack1-2build2.
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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 | /* This file is part of the Palabos library.
*
* Copyright (C) 2011-2015 FlowKit Sarl
* Route d'Oron 2
* 1010 Lausanne, Switzerland
* E-mail contact: contact@flowkit.com
*
* The most recent release of Palabos can be downloaded at
* <http://www.palabos.org/>
*
* The library Palabos is free software: you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* The library 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Orestis Malaspinas contributed this code.
*/
/** \file
* A collection of dynamics classes (e.g. BGK) with which a Cell object
* can be instantiated -- header file.
*/
#ifndef ENTROPIC_LB_HELPERS_H
#define ENTROPIC_LB_HELPERS_H
#include "core/globalDefs.h"
#include "latticeBoltzmann/geometricOperationTemplates.h"
#include <cmath>
namespace plb {
template<typename T, template<typename U> class Descriptor>
struct entropicLbTemplates
{
/// Computation of equilibrium distribution
static T equilibrium( plint iPop, T rho, Array<T,Descriptor<T>::d> const& u)
{
typedef Descriptor<T> L;
const T invCs = std::sqrt(L::invCs2);
const T sqt3 = std::sqrt((T)3.0);
T prod = (T)1;
for (int iD=0; iD < Descriptor<T>::d; ++iD)
{
T uc = u[iD] * invCs; // u[iD] / c_s
prod *= ((T)2 - std::sqrt((T)1.0+uc*uc)) *
std::pow(((T)2.0 / sqt3 * uc +
std::sqrt((T)1.0+uc*uc))/((T)1.0-uc/sqt3),
L::c[iPop][iD]/sqt3*invCs);
}
return rho*L::t[iPop]*prod-L::SkordosFactor()*L::t[iPop];
}
/// Computation of equilibrium distribution
static T equilibriumApprox( plint iPop, T rho, Array<T,Descriptor<T>::d> const& u)
{
typedef Descriptor<T> L;
T uSqr = VectorTemplate<T,Descriptor>::normSqr(u);
T cu = T();
for (int iD=0; iD < Descriptor<T>::d; ++iD)
{
cu += L::c[iPop][iD]*u[iD];
}
return rho * L::t[iPop] * ((T)1.0 +
cu*L::invCs2 - (T)0.5 * uSqr*L::invCs2 + (T)0.5*std::pow(L::invCs2,(T)2)*cu*cu
- (T)0.5*std::pow(L::invCs2,(T)2)*cu*uSqr + std::pow(cu,(T)3)*std::pow(L::invCs2,(T)3)/(T)6.0
+ (T)0.125*uSqr*uSqr*std::pow(L::invCs2,(T)2) - (T)0.25*cu*cu*uSqr*std::pow(L::invCs2,(T)3)
+ std::pow(cu,(T)4)*std::pow(L::invCs2,(T)4)/(T)24.0)-L::SkordosFactor()*L::t[iPop];
}
};
}
#include "latticeBoltzmann/entropicLbTemplates2D.h"
#include "latticeBoltzmann/entropicLbTemplates3D.h"
#endif
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