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#pragma once
#include "descriptor.hpp"
namespace kel {
namespace lbm {
/**
* Calculate the macroscopic variables rho and u in Lattice Units.
*/
template<typename T, typename Desc>
void compute_rho_u (
const saw::data<sch::Cell<T, Desc, 0, 0, 1>>& dfs,
typename saw::native_data_type<T>::type& rho,
std::array<typename saw::native_data_type<T>::type, 2>& vel
)
{
using dfi = df_info<T, Desc>;
rho = 0;
std::fill(vel.begin(), vel.end(), 0);
for(size_t j = 0; j < Desc::Q; ++j){
rho += dfs(j).get();
for(size_t i = 0; i < Desc::D; ++i){
vel[i] += dfi::directions[j][i] * dfs(j).get();
}
}
for(size_t i = 0; i < Desc::D; ++i){
vel[i] /= rho;
}
}
/**
* Calculate the macroscopic variables rho and u in Lattice Units.
*/
template<typename T, typename Desc>
void compute_rho_u (
const saw::data<sch::Cell<T, Desc, 0, 0, 1>>& dfs,
saw::ref<saw::data<T>> rho,
saw::ref<saw::data<sch::FixedArray<T,Desc::D>>> vel
)
{
using dfi = df_info<T, Desc>;
rho().set(0);
for(uint64_t i = 0; i < Desc::D; ++i){
vel().at({i}).set(0);
}
for(size_t j = 0; j < Desc::Q; ++j){
rho = rho + dfs(j);
for(size_t i = 0; i < Desc::D; ++i){
vel[i] = vel[i] + saw::data<T>{dfi::directions[j][i]} * dfs(j);
}
}
for(size_t i = 0; i < Desc::D; ++i){
vel[i] = vel[i] / rho;
}
}
}
}
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