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
|
/* This file is part of the OpenLB library
*
* Copyright (C) 2007 Orestis Malaspinas, Jonas Latt
* 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.
*/
#ifndef EXTENDED_FINITE_DIFFERENCE_BOUNDARY_2D_H
#define EXTENDED_FINITE_DIFFERENCE_BOUNDARY_2D_H
#include "core/postProcessing.h"
#include "momentaOnBoundaries.h"
#include "core/blockLattice2D.h"
#include "boundaryCondition2D.h"
namespace olb {
/**
* This class computes the finite difference approximation to LB boundary conditions
* on a flat wall in 2D with all the terms of the CE expansion. The details
* on the computations can be found in the thesis of
* Jonas Latt, "Hydrodynamic limit of lattice Boltzmann equations",
* University of Geneva, (2007).
*/
template<typename T, typename DESCRIPTOR, int direction, int orientation>
class ExtendedStraightFdBoundaryPostProcessor2D : public LocalPostProcessor2D<T,DESCRIPTOR> {
public:
ExtendedStraightFdBoundaryPostProcessor2D(int x0_, int x1_, int y0_, int y1_);
int extent() const override
{
return 1;
}
int extent(int whichDirection) const override
{
return 1;
}
void process(BlockLattice2D<T,DESCRIPTOR>& blockLattice) override;
void processSubDomain(BlockLattice2D<T,DESCRIPTOR>& blockLattice,
int x0_, int x1_, int y0_, int y1_ ) override;
private:
template<int deriveDirection>
void interpolateGradients(BlockLattice2D<T,DESCRIPTOR> const& blockLattice,
T velDeriv[DESCRIPTOR::d], int iX, int iY) const;
template<int deriveDirection>
void interpolateGradients (
BlockLattice2D<T,DESCRIPTOR> const& blockLattice,T& rhoDeriv,
int iX, int iY ) const;
private:
int x0, x1, y0, y1;
};
template<typename T, typename DESCRIPTOR, int direction, int orientation>
class ExtendedStraightFdBoundaryProcessorGenerator2D : public PostProcessorGenerator2D<T,DESCRIPTOR> {
public:
ExtendedStraightFdBoundaryProcessorGenerator2D(int x0_, int x1_, int y0_, int y1_);
PostProcessor2D<T,DESCRIPTOR>* generate() const override;
PostProcessorGenerator2D<T,DESCRIPTOR>* clone() const override;
};
////////// Factory function for Extended Finite Difference BC ///////////////////////////////
template<typename T, typename DESCRIPTOR, typename MixinDynamics=BGKdynamics<T,DESCRIPTOR> >
OnLatticeBoundaryCondition2D<T,DESCRIPTOR>*
createExtendedFdBoundaryCondition2D(BlockLatticeStructure2D<T,DESCRIPTOR>& block);
} // namespace olb
#endif
|
