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#pragma once
#include "common.hpp"
#include "macroscopic.hpp"
#include "component.hpp"
#include "equilibrium.hpp"
namespace kel {
namespace lbm {
namespace cmpt {
// Gather the force, Luke!
struct ForceGather {};
}
template<typename T, typename Descriptor, typename Encode>
class component<T,Descriptor,cmpt::ForceGather, Encode> {
private:
public:
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& porous = porous_f.at(index);
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);
}
auto& dfs = dfs_old_f.at(index);
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 * saw::data<T>{dfi::directions[i][k]};
}
}
saw::data<sch::Scalar<T>> one;
one.at({}) = 1.0;
auto flip_porous = one - porous;
force = force * flip_porous;
}
};
}
}
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