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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
#pragma once
#include "macroscopic.hpp"
#include "component.hpp"
#include "equilibrium.hpp"
namespace kel {
namespace lbm {
namespace cmpt {
struct PsmReset {};
struct PsmOneParticle {};
struct Psm {};
}
template<typename T, typename Descriptor, typename Encode>
class component<T, Descriptor, cmpt::PsmReset, Encode> final {
public:
component() = default;
template<typename CellFieldSchema, typename MacroFieldSchema>
void apply(const saw::data<CellFieldSchema, Encode>& field, const saw::data<MacroFieldSchema,Encode>& macros, saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> index, saw::data<sch::UInt64> time_step) const {
auto& porosity_f = macros.template get<"porosity">();
auto& por = porosity_f.at(index);
por.at({}) = 1.0;
}
};
/**
* PSM collision operator for LBM
*/
template<typename T, typename Descriptor, typename Encode>
class component<T, Descriptor, cmpt::Psm, Encode> {
private:
saw::data<T> relaxation_;
saw::data<T> frequency_;
public:
component(
typename saw::native_data_type<T>::type relaxation__
):
relaxation_{relaxation__}
{
saw::data<T> one;
one = 1.0;
frequency_ = one / relaxation_;
}
template<typename CellFieldSchema, typename MacroFieldSchema>
void apply(const saw::data<CellFieldSchema, Encode>& field, const saw::data<MacroFieldSchema,Encode>& macros, saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> index, saw::data<sch::UInt64> time_step) const {
using dfi = df_info<T,Descriptor>;
bool is_even = ((time_step.get() % 2) == 0);
auto& dfs_old_f = (is_even) ? field.template get<"dfs_old">() : field.template get<"dfs">();
auto& porous_f = macros.template get<"porosity">();
auto& rho_f = macros.template get<"density">();
auto& vel_f = macros.template get<"velocity">();
saw::data<sch::Scalar<T>>& rho = rho_f.at(index);
saw::data<sch::Vector<T,Descriptor::D>>& vel = vel_f.at(index);
compute_rho_u<T,Descriptor>(dfs_old_f.at(index),rho,vel);
auto eq = equilibrium<T,Descriptor>(rho,vel);
saw::data<T> one{1.0};
auto& porous = porous_f.at(index);
auto flip_porous = one - porous.at({});
auto& dfs = dfs_old_f.at(index);
auto dfs_cpy = dfs;
for(uint64_t i = 0u; i < Descriptor::Q; ++i){
uint64_t i_opp = dfi::opposite_index[i];
dfs.at({i}) = dfs_cpy.at({i}) + frequency_ * (eq.at(i) - dfs_cpy.at({i})) * porous.at({}) + (dfs_cpy.at({i_opp}) - dfs_cpy.at({i}) ) * flip_porous;
}
auto& force_f = macros.template get<"force">();
auto& force = force_f.at(index);
for(uint64_t k{0u}; k < Descriptor::D; ++k){
force.at({{k}}).set(0);
}
for(uint64_t i{0u}; i < Descriptor::Q; ++i){
uint64_t i_opp = dfi::opposite_index[i];
auto dfs_diff = dfs.at({i}) - dfs.at({i_opp});
for(uint64_t k{0u}; k < Descriptor::D; ++k){
force.at({{k}}) = force.at({{k}}) + dfs_diff * dfi::directions[i][k];
}
}
force = force * porous;
}
};
/**
* PSM collision operator for LBM
*/
template<typename T, typename Descriptor, typename Encode>
class component<T, Descriptor, cmpt::PsmOneParticle, Encode> final {
private:
public:
component() = default;
template<typename CellFieldSchema, typename MacroFieldSchema, typename ParticleSchema>
void apply(const saw::data<CellFieldSchema, Encode>& field, const saw::data<MacroFieldSchema,Encode>& macros, const saw::data<ParticleSchema,Encode>& pg, saw::data<sch::FixedArray<sch::UInt64,1u>> index, saw::data<sch::UInt64> time_step, saw::data<sch::UInt64> sub_steps) const {
using dfi = df_info<T,Descriptor>;
bool is_even = ((time_step.get() % 2) == 0);
saw::data<sch::Scalar<T>> one;
one.at({}) = 1.0;
auto& dfs_old_f = (is_even) ? field.template get<"dfs_old">() : field.template get<"dfs">();
auto& por_f = macros.template get<"porosity">();
auto& rho_f = macros.template get<"density">();
auto& vel_f = macros.template get<"velocity">();
auto& force_f = macros.template get<"force">();
{
auto parts = pg.template get<"particles">();
auto parts_size = parts.meta().at({0u});
auto& p_coll = pg.template get<"collision">().at({});
auto& p_rad = p_coll.template get<"radius">();
auto& pi = parts.at(index);
auto& pirb = pi.template get<"rigid_body">();
saw::data<sch::Vector<T,Descriptor::D>>& pirb_pos = pirb.template get<"position">();
auto& pirb_pos_old = pirb.template get<"position_old">();
saw::data<sch::Scalar<T>> ts;
ts.at({}) = one.at({}) / sub_steps.template cast_to<T>();
saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> start;
saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> stop;
auto eo_aabb = particle_aabb<typename ParticleSchema::ValueType>::calculate(pg,{{0u}},vel_f.meta());
if(eo_aabb.is_error()){
return;
}
auto& aabb = eo_aabb.get_value();
/// Ok, I iterate over the space which covers our particle? So lower bounds to upper bounds
start = aabb.template get<"a">();
stop = aabb.template get<"b">();
saw::data<sch::Vector<T,Descriptor::D>> force_p;
for(uint64_t i{0u}; i < Descriptor::D; ++i){
force_p.at({{i}}) = 0.0;
}
auto vel_p_old = (pirb_pos-pirb_pos_old) / ts;
iterator<Descriptor::D>::apply([&](const auto& index_f) -> void{
// ask for the d_k value here.
// For every value im iterating over I need sth
// std::cout<<"Pos: "<<index.at({0u}).get()<<" "<<index.at({1u}).get()<<std::endl;
auto& dfs = dfs_old_f.at(index_f);
saw::data<sch::Vector<T,Descriptor::D>> rel_dist = saw::math::vectorize_data(index_f).template cast_to<T>() - pirb_pos;
saw::data<sch::Scalar<T>> eps;
eps.at({}) = 1.5f;
auto& por = por_f.at(index_f);
por = particle_porosity<T,Descriptor::D,1u,por::ParticleSpheroid<T>>::calculate(rel_dist,p_rad,eps);
if(por.at({}).get() >= 1.0f){
return;
}
saw::data<sch::Vector<T,Descriptor::D>> momentum;
for(uint64_t i{0u}; i < Descriptor::D; ++i){
momentum.at({{i}}) = 0.0;
}
for(uint64_t i{0u}; i < Descriptor::Q; ++i){
saw::data<sch::Vector<T,Descriptor::D>> e_i;
saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> n_ind_i;
for(uint64_t k{0u}; k < Descriptor::D; ++k){
e_i.at({{k}}) = (dfi::directions[i])[k];
n_ind_i.at({k}) = index_f.at({k}) + (dfi::directions[i])[k];
}
uint64_t i_opp = dfi::opposite_index[i];
auto u_p_e = saw::math::dot(e_i,vel_p_old);
saw::data<T> dfs_added = dfs.at({i})*(saw::data<T>{1}-u_p_e.at({})) + dfs_old_f.at(n_ind_i).at({i_opp})*(saw::data<T>{1}+u_p_e.at({}));
saw::data<sch::Scalar<T>> dfs_added_v;
dfs_added_v.at({}) = dfs_added;
auto ei_dfs = e_i * dfs_added_v;
momentum = momentum + ei_dfs;
}
// technically needs to adjust for rotation as well
auto& force = force_f.at(index_f);
auto& rho = rho_f.at(index_f);
// To Fluid
auto flip_por = one - por;
force = momentum * flip_por;
// To Particle
force_p = force_p - force;
},start,stop);
auto& pirb_acc = pirb.template get<"acceleration">();
pirb_acc = force_p / pg.template get<"total_mass">().at({});
for(saw::data<sch::UInt64> i{0u}; i < sub_steps; ++i){
verlet_step_lambda<T,Descriptor::D>(pi,ts);
}
}
}
};
}
}
|
