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
|
/* This file is part of the OpenLB library
*
* Copyright (C) 2017 Albert Mink, Christopher McHardy
* E-mail contact: info@openlb.net
* The most recent release of OpenLB can be downloaded at
* <http://www.openlb.net/>
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/** \file
* A collection of radiative transport dynamics classes -- header file.
*/
#ifndef RTLBM_DYNAMICS_H
#define RTLBM_DYNAMICS_H
#include "dynamics/dynamics.h"
namespace olb {
/**
* Solves RTE according Christopher McHardy et al 2016.
* absorption and scattering coefficient:
* \f$ \sigma_a \f$ and \f$ \sigma_s \f$
*
* \param omega change into beta the extinction coefficient
* \param singleScatAlbedo is the single scattering albedo, given by \f$ \frac{\sigma_s}{\sigma_a + \sigma_s} \f$
*/
template<typename T, typename DESCRIPTOR>
class RTLBMdynamicsMcHardy : public BasicDynamics<T, DESCRIPTOR> {
public:
/// Constructor
RTLBMdynamicsMcHardy( Momenta<T,DESCRIPTOR>& momenta, T latticeAbsorption, T latticeScattering, std::array<std::array<T,DESCRIPTOR::q>, DESCRIPTOR::q>& anisoMatrix );
/// Compute equilibrium distribution function
T computeEquilibrium( int iPop, T rho, const T u[DESCRIPTOR::d], T uSqr ) const override;
/// Collision step
void collide( Cell<T, DESCRIPTOR>& cell, LatticeStatistics<T>& statistics ) override;
/// Get local relaxation parameter of the dynamics
T getOmega() const override;
/// Set local relaxation parameter of the dynamics
void setOmega( T omega ) override;
T getSink() const;
protected:
T _absorption;
T _scattering;
std::array<std::array<T,DESCRIPTOR::q>, DESCRIPTOR::q>& _anisoMatrix;
};
template<typename T, typename DESCRIPTOR>
class RTLBMdynamicsMcHardyRK : public BasicDynamics<T, DESCRIPTOR> {
public:
/// Constructor
RTLBMdynamicsMcHardyRK( Momenta<T,DESCRIPTOR>& momenta, T latticeAbsorption, T latticeScattering, std::array<std::array<T,DESCRIPTOR::q>, DESCRIPTOR::q>& anisoMatrix );
/// Compute equilibrium distribution function
T computeEquilibrium( int iPop, T rho, const T u[DESCRIPTOR::d], T uSqr ) const override;
/// Collision step
void collide( Cell<T, DESCRIPTOR>& cell, LatticeStatistics<T>& statistics ) override;
/// Get local relaxation parameter of the dynamics
T getOmega() const override;
/// Set local relaxation parameter of the dynamics
void setOmega( T omega ) override;
private:
void computeEquilibriumAniso( Cell<T,DESCRIPTOR>& cell, std::array<T,DESCRIPTOR::q>& feq );
std::array<T,DESCRIPTOR::q> doCollision( Cell<T,DESCRIPTOR>& cell, std::array<T,DESCRIPTOR::q>& feq );
T _absorption;
T _scattering;
std::array<std::array<T,DESCRIPTOR::q>, DESCRIPTOR::q>& _anisoMatrix;
};
} // namespace olb
#endif
|
