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#pragma once
#include "component.hpp"
#include "equilibrium.hpp"
namespace kel {
namespace lbm {
namespace cmpt {
struct BGK {};
}
/**
* Standard BGK collision operator for LBM
*/
template<typename T, typename Descriptor>
class component<T, Descriptor, cmpt::BGK> {
private:
typename saw::native_data_type<T>::type relaxation_;
public:
component(typename saw::native_data_type<T>::type relaxation__):
relaxation_{relaxation__}
{}
using Component = cmpt::BGK;
/**
* Thoughts regarding automating order setup
*/
using access = cmpt::access_tuple<
cmpt::access<"dfs", 1, true, true, true>
>;
/**
* Thoughts regarding automating order setup
*/
static constexpr saw::string_literal name = "collision";
static constexpr saw::string_literal after = "";
static constexpr saw::string_literal before = "streaming";
/**
* Raw setup
*/
template<typename CellFieldSchema>
void apply(saw::data<CellFieldSchema>& field, saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> index, uint64_t time_step){
bool is_even = ((time_step % 2) == 0);
auto& cell = field(index);
auto& dfs_old = (is_even) ? cell.template get<"dfs_old">() : cell.template get<"dfs">();
auto& dfs = (not is_even) ? cell.template get<"dfs_old">() : cell.template get<"dfs">();
saw::data<T> rho;
saw::data<sch::FixedArray<T,Descriptor::D>> vel;
compute_rho_u<T,Descriptor>(dfs_old,rho,vel);
auto eq = equilibrium<T,Descriptor>(rho,vel);
for(uint64_t i = 0u; i < Descriptor::Q; ++i){
dfs_old({i}).set(dfs_old({i}).get() + (1.0 / relaxation_) * (eq.at(i).get() - dfs_old({i}).get()));
}
}
};
}
}
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