/usr/include/palabos/latticeBoltzmann/offEquilibriumAdvectionDiffusionTemplates.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 89 90 91 | /* 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/>.
*/
/* Main author: Orestis Malaspinas
*/
/** \file
* Specialized helper functions for advanced techniques around LB
* implementations. They implement the physics of the first-order terms
* of the Chapman-Enskog expansion and are useful whenever a transition
* from hydrodynamical variables (rho, u) to kinetic variables (f) si to
* be implemented. Additionally, they are used for the implementation of
* the stable RLB dynamics.
*
* This file is all about efficiency. The generic
* template code is specialized for commonly used Lattices, so that a
* maximum performance can be taken out of each case.
*/
#ifndef ADVECTION_DIFFUSION_OFF_EQUILIBRIUM_TEMPLATES_H
#define ADVECTION_DIFFUSION_OFF_EQUILIBRIUM_TEMPLATES_H
#include "core/globalDefs.h"
#include "core/cell.h"
#include "core/util.h"
namespace plb {
template<typename T, class Descriptor> struct offEquilibriumAdvectionDiffusionTemplatesImpl;
/// General first-order functions
template<typename T, template<typename U> class Descriptor>
struct offEquilibriumAdvectionDiffusionTemplates {
/// Compute off-equilibrium part of the f's from the current j.
/** Implements the following formula (with Einstein index contraction):
* /f[ f_i^{neq} = t_i / (c_s^4) *
* (c_{ia} j_a /f]
* By Pi we mean the tensor computed from the off-equilibrium functions:
* /f[ j_a = \sum c_{ia} f_i^{neq}
* = \sum c_{ia} f_i - \rho u_a Id /f]
* where u_a is an external vectorial field (the velocity for example)
*/
static T fromJtoFneq(plint iPop, Array<T,Descriptor<T>::d> const& jNeq) {
return offEquilibriumAdvectionDiffusionTemplatesImpl<T,typename Descriptor<T>::BaseDescriptor>
::fromJtoFneq(iPop, jNeq);
}
}; // struct offEquilibriumAdvectionDiffusionTemplates
template<typename T, class Descriptor>
struct offEquilibriumAdvectionDiffusionTemplatesImpl {
static T fromJtoFneq (
plint iPop, Array<T,Descriptor::d> const& jNeq )
{
T fNeq = (T)Descriptor::c[iPop][0]*jNeq[0];
for (plint iD=1; iD<Descriptor::d; ++iD)
{
fNeq += (T)Descriptor::c[iPop][iD]*jNeq[iD];
}
fNeq *= Descriptor::t[iPop] * Descriptor::invCs2;
return fNeq;
}
}; // struct offEquilibriumAdvectionDiffusionTemplates
} // namespace plb
#endif
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