From 595cdfd51594af7cee4258a1ed92b06c6bf0171d Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 11 Feb 2026 17:27:59 +0100
Subject: Fixing

---
 lib/core/c++/hlbm.hpp | 37 +++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

(limited to 'lib/core/c++/hlbm.hpp')

diff --git a/lib/core/c++/hlbm.hpp b/lib/core/c++/hlbm.hpp
index f8f0118..8f267d5 100644
--- a/lib/core/c++/hlbm.hpp
+++ b/lib/core/c++/hlbm.hpp
@@ -14,16 +14,49 @@ struct HLBM {};
  * HLBM collision operator for LBM
  */
 template<typename T, typename Descriptor, typename Encode>
-class component<T, Descriptor, cmpt::HLBM> {
+class component<T, Descriptor, cmpt::HLBM, Encode> final {
 private:
+	typename saw::native_data_type<T>::type relaxation_;
+	saw::data<T> frequency_;
 public:
-	component() = default;
+	component(typename saw::native_data_type<T>::type relaxation__):
+		relaxation_{relaxation__},
+		frequency_{typename saw::native_data_type<T>::type(1) / relaxation_}
+	{}
 
 	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 {
 		
 		bool is_even = ((time_step.get() % 2) == 0);
 
+		auto& dfs_old_f = (is_even) ? field.template get<"dfs_old">() : field.template get<"dfs">();
+		auto& particle_N_f = field.template get<"particle_N">();
+		auto& particle_D_f = field.template get<"particle_D">();
+
+		auto& porosity_f = macros.template get<"porosity">();
+		auto& rho_f = macros.template get<"density">();
+		auto& vel_f = macros.template get<"velocity">();
+
+		saw::data<sch::Scalar<T>>& rho = rho_f.at(index);
+		saw::data<sch::Vector<T,Descriptor::D>> vel = vel_f.at(index);
+
+		compute_rho_u<T,Descriptor::D>(dfs_old_f.at(index), rho, vel);
+
+		auto& porosity = porosity_f.at(index);
+		auto flip_porosity = saw::data<sch::Scalar<T>>{1.0} - porosity;
+
+		auto& N = particle_N_f.at(index);
+		auto& D = particle_D_f.at(index);
+		// Convex combination of velocities
+		vel = vel * flip_porosity + N * porosity / D;
+		// Equilibrium
+		auto eq = equilibrium<T,Descriptor>(rho,vel);
+
+		for(uint64_t i = 0u; i < Descriptor::Q; ++i){
+			dfs_old_f.at(index).at({i}) = dfs_old_f.at(index).at({i}) + frequency_ * (eq.at(i) - dfs_old_f.at(index).at({i}));
+		}
+
+		porosity.at({}) = 1.0;
 
 	}
 };
-- 
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