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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::FixedArray<T,Desc::Q>>& dfs,
saw::ref<saw::data<sch::Scalar<T>>> rho,
saw::ref<saw::data<sch::Vector<T,Desc::D>>> vel
)
{
using dfi = df_info<T, Desc>;
rho().at({}).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().at({}) = rho().at({}) + dfs.at({j});
for(size_t i = 0; i < Desc::D; ++i){
vel().at({{i}}) = vel().at({{i}}) + saw::data<T>{static_cast<typename saw::native_data_type<T>::type>(dfi::directions[j][i])} * dfs.at({j});
}
}
for(size_t i = 0; i < Desc::D; ++i){
vel().at({{i}}) = vel().at({{i}}) / rho().at({});
}
}
}
}
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