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#include "../c++/descriptor.hpp"
#include "../c++/equilibrium.hpp"
#include <forstio/codec/data.hpp>
#include <iostream>
namespace kel {
namespace lbm {
namespace sch {
using namespace saw::schema;
/**
* Basic distribution function
* Base type
* D
* Q
* Scalar factor
* D factor
* Q factor
*/
using T = Float32;
using D2Q5 = Descriptor<2,5>;
using D2Q9 = Descriptor<2,9>;
template<typename Desc>
using DfCell = Cell<T, Desc, 0, 0, 1>;
template<typename Desc>
using CellInfo = Cell<UInt8, D2Q9, 1, 0, 0>;
/**
* Basic type for simulation
*/
template<typename Desc>
using CellStruct = Struct<
Member<DfCell<Desc>, "dfs">,
Member<DfCell<Desc>, "dfs_old">,
Member<CellInfo<Desc>, "info">,
Member<UInt8, "geometry">,
Member<UInt32, "particle">
>;
template<typename T, uint64_t D>
using MacroStruct = Struct<
Member<FixedArray<T,D>, "velocity">,
Member<T, "pressure">
>;
using CavityFieldD2Q9 = CellField<D2Q9, CellStruct<D2Q9>>;
}
}
}
void set_geometry(saw::data<kel::lbm::sch::CavityFieldD2Q9>& latt){
using namespace kel::lbm;
/*
apply_for_cells([](auto& cell, std::size_t i, std::size_t j){
uint8_t val = 0;
if(j == 1){
val = 2u;
}
if(i == 1 || (i+2) == dim_x || (j+2) == dim_y){
val = 3u;
}
if(i > 1 && (i+2) < dim_x && j > 1 && (j+2) < dim_y){
val = 1u;
}
if(i == 0 || j == 0 || (i+1) == dim_x || (j+1) == dim_y){
val = 0u;
}
cell.template get<"info">()(0u).set(val);
}, latt);
*/
}
void lbm_step(
saw::data<kel::lbm::sch::CavityFieldD2Q9>& latt,
bool even_step
){
using namespace kel::lbm;
using dfi = df_info<sch::T,sch::D2Q9>;
component<cmpt::BGK,sch::D2Q9> coll;
coll.relaxation_ = 0.5384;
component<cmpt::ConstRhoBGK,sch::D2Q9> rho_coll;
rho_coll.relaxation_ = 0.5384;
rho_coll.rho_ = 1.0;
component<cmpt::BounceBack,sch::D2Q9> bb;
component<cmpt::MovingWall,sch::D2Q9> bb_lid;
bb_lid.lid_vel = {0.1,0.0};
// Collide
apply_for_cells([&](auto& cell, std::size_t i, std::size_t j){
auto& df = even_step ? cell.template get<"dfs_old">() : cell.template get<"dfs">();
auto& info = cell.template get<"info">();
auto info_val = info({0u}).get();
switch(info_val){
case 1u:
coll.apply(df);
break;
case 2u:
// bb.apply(df);
bb_lid.apply(df);
break;
case 3u:
bb.apply(df);
break;
}
}, latt);
// Stream
for(uint64_t i = 1; (i+1) < latt.template get_dim_size<0>().get(); ++i){
for(uint64_t j = 1; (j+1) < latt.template get_dim_size<1>().get(); ++j){
auto& cell = latt({{i,j}});
auto& df_new = even_step ? cell.template get<"dfs">() : cell.template get<"dfs_old">();
auto& info_new = cell.template get<"info">();
if(info_new({0u}).get() > 0u && info_new({0u}).get() != 2u){
for(uint64_t k = 0u; k < sch::D2Q9::Q; ++k){
auto dir = dfi::directions[dfi::opposite_index[k]];
auto& cell_dir_old = latt({{i+dir[0],j+dir[1]}});
auto& df_old = even_step ? cell_dir_old.template get<"dfs_old">() : cell_dir_old.template get<"dfs">();
auto& info_old = cell_dir_old.template get<"info">();
if( info_old({0}).get() == 2u ){
auto& df_old_loc = even_step ? latt({{i,j}}).template get<"dfs_old">() : latt({{i,j}}).template get<"dfs">();
df_new({k}) = df_old_loc({dfi::opposite_index.at(k)}) - 2.0 * dfi::inv_cs2 * dfi::weights.at(k) * 1.0 * ( bb_lid.lid_vel[0] * dir[0] + bb_lid.lid_vel[1] * dir[1]);
// dfs({dfi::opposite_index.at(i)}) = dfs_cpy({i}) - 2.0 * dfi::weights[i] * 1.0 * ( lid_vel[0] * dfi::directions[i][0] + lid_vel[1] * dfi::directions[i][1]) * dfi::inv_cs2;
} else {
df_new({k}) = df_old({k});
}
}
}
}
}
}
int main(int argc, char** argv){
using namespace kel::lbm;
std::string_view cfg_file_name = "config.json";
if(argc > 1){
cfg_file_name = argv[1];
}
auto eo_conf = load_lbm_config<sch::Float64,sch::Descriptor<2,9>>(cfg_file_name);
if(eo_conf.is_error()){
auto& err = eo_conf.get_error();
std::cerr<<"[Error]: "<<err.get_category();
auto err_msg = err.get_message();
if(!err_msg.empty()){
std::cerr<<" - "<<err_msg;
}
std::cerr<<std::endl;
return err.get_id();
}
auto& conf = eo_conf.get_value();
converter<sch::Float64> conv{
{conf.template get<"delta_x">()},
{conf.template get<"delta_t">()}
};
print_lbm_meta<sch::Float64,sch::Descriptor<2,9>>(conv, {conf.template get<"kinematic_viscosity">()});
saw::data<sch::FixedArray<sch::UInt64,sch::D2Q9::D>> dim{{128, 128}};
saw::data<sch::CavityFieldD2Q9, saw::encode::Native> lattice{dim};
lbm::particle_system<sch::T,2,sch::Particle<sch::T,2>> system;
/**
* Set meta information describing what this cell is
*/
set_geometry(lattice);
uint64_t lattice_steps{128u};
uint64_t print_every{64u};
bool even_step{true};
uint64_t file_num{0u};
saw::data<sch::Array<sch::MacroStruct<sch::T,sch::D2Q9::D>,sch::D2Q9::D>> macros{dim};
for(uint64_t step{0u}; step < lattice_steps; ++step){
lbm_step(lattice, even_step);
even_step = not even_step;
}
return 0;
}
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