From 530bd236a0aee9c22b87de236164c59afe6adae7 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sat, 25 Jul 2026 23:17:18 +0200
Subject: dangling

---
 modules/core/c++/hlbm.hpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'modules')

diff --git a/modules/core/c++/hlbm.hpp b/modules/core/c++/hlbm.hpp
index bb21ae5..fc19728 100644
--- a/modules/core/c++/hlbm.hpp
+++ b/modules/core/c++/hlbm.hpp
@@ -17,6 +17,9 @@ struct HlbmOneParticle {};
 struct HlbmParticle {};
 struct HlbmOneParticleMomentumExchange {};
 }
+namespace method {
+struct Hlbm {};
+}
 
 template<typename T, typename Descriptor, typename Encode>
 class component<T, Descriptor, cmpt::HlbmReset, Encode> final {
-- 
cgit v1.2.3


From a826f7d9d4bb48565036dd665cb4c6a54622010d Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 27 Jul 2026 21:53:27 +0200
Subject: Dangling

---
 modules/core/c++/fplbm.hpp | 117 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)

(limited to 'modules')

diff --git a/modules/core/c++/fplbm.hpp b/modules/core/c++/fplbm.hpp
index c974472..34806aa 100644
--- a/modules/core/c++/fplbm.hpp
+++ b/modules/core/c++/fplbm.hpp
@@ -5,9 +5,31 @@
 namespace kel {
 namespace lbm {
 namespace cmpt {
+struct FpLbmReset{};
 struct FpLbm {};
+struct FpLbmOneParticle {};
 struct FpLbmOneParticleNoVelocity{};
 }
+namespace method {
+struct FpLbm {};
+}
+
+template<typename T, typename Descriptor, typename Encode>
+class component<T, Descriptor, cmpt::FpLbmReset, Encode> final {
+public:
+	using Component = cmpt::FpLbmReset;
+private:
+public:
+	component() = default;
+
+	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 {
+		auto& por_f = macros.template get<"porosity">();
+
+		auto& por = por_f.at(index);
+		por.at({}) = 1.0;
+	}
+};
 
 template<typename T, typename Descriptor, typename Encode>
 class component<T, Descriptor, cmpt::FpLbm, Encode> final {
@@ -84,6 +106,101 @@ public:
 	}
 };
 
+template<typename T, typename Descriptor, typename Encode>
+class component<T, Descriptor, cmpt::FpLbmOneParticle, Encode> final {
+public:
+	using Component = cmpt::FpLbmOneParticle;
+private:
+public:
+	component() = default;
+
+	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 {
+	// void apply(saw::data<CellFieldSchema, Encode>& field, saw::data<sch::FixedArray<sch::UInt64, Descriptor::D>> index, saw::data<sch::UInt64> time_step){
+		bool is_even = ((time_step.get() % 2) == 0);
+
+		auto& dfs_old_f = (is_even) ? field.template get<"dfs_old">() : field.template get<"dfs">();
+		auto& dfs = dfs_old_f.at(index);
+
+		auto& rho_f = macros.template get<"density">();
+		auto& vel_f = macros.template get<"velocity">();
+		auto& por_f = macros.template get<"porosity">();
+
+		// Temporary find a better way
+		auto& force_f = macros.template get<"force">();
+
+
+		/**
+		 * The other methods all work with a flipped porosity.
+		 * For compat reasons this is also flipped
+		 */
+		auto porosity = por_f.at(index);
+		saw::data<sch::Scalar<T>> one;
+		one.at({}) = 1.0;
+		auto flip_porosity = one - porosity;
+
+		saw::data<sch::Scalar<T>>& rho = rho_f.at(index);
+
+		saw::data<sch::Scalar<T>> half;
+		half.at({}).set(0.5);
+		saw::data<sch::Vector<T,Descriptor::D>>& vel = vel_f.at(index);// + total_force * ( half / rho );
+
+		compute_rho_u<T,Descriptor>(dfs_old_f.at(index),rho,vel);
+		auto eq = equilibrium<T,Descriptor>(rho,vel);
+
+		using dfi = df_info<T,Descriptor>;
+
+		saw::data<sch::Scalar<T>> min_two;
+		min_two.at({}).set(-2);
+
+		// Maybe ? 
+		auto& force = force_f.at(index);
+		force = vel * rho * min_two * flip_porosity;
+
+		saw::data<sch::Scalar<T>> dfi_inv_cs2;
+		dfi_inv_cs2.at({}).set(dfi::inv_cs2);
+
+		// auto vel = vel_f.at(index);
+
+		for(uint64_t i = 0u; i < Descriptor::Q; ++i){
+			// saw::data<T> ci_min_u{0};
+			saw::data<sch::Vector<T,Descriptor::D>> ci;
+			for(uint64_t d = 0u; d < Descriptor::D; ++d){
+				ci.at({{d}}).set(static_cast<typename saw::native_data_type<T>::type>(dfi::directions[i][d]));
+			}
+			auto ci_dot_u = saw::math::dot(ci,vel);
+
+			// saw::data<sch::Vector<T,Descriptor::D>> F_i;
+			// F_i = f * ((c_i - u) * ics2  + <c_i,u> * c_i * ics2 * ics2) * w_i;
+			saw::data<sch::Scalar<T>> w;
+			w.at({}).set(dfi::weights[i]);
+
+			/*
+			saw::data<sch::Scalar<T>> F_i_sum;
+			for(uint64_t d = 0u; d < Descriptor::D; ++d){
+				saw::data<sch::Scalar<T>> F_i_d;
+				F_i_d.at({}) = F_i.at({{d}});
+				F_i_sum = F_i_sum + F_i_d;
+			}
+			*/
+			auto term1 = (ci-vel) * dfi_inv_cs2;
+			auto term2 = ci * (ci_dot_u * dfi_inv_cs2 * dfi_inv_cs2);
+
+			auto force_projection = saw::math::dot(term1 + term2, force);
+
+			auto F_i = w * force_projection;
+
+			dfs.at({i}) = dfs.at({i})
+									+ frequency_
+										* (eq.at(i) - dfs.at({i}) )
+									+ F_i.at({})
+										* (saw::data<T>{1} - saw::data<T>{0.5f} * frequency_);
+		}
+	}
+
+
+};
+
 template<typename T, typename Descriptor, typename Encode>
 class component<T, Descriptor, cmpt::FpLbmOneParticleNoVelocity, Encode> final {
 private:
-- 
cgit v1.2.3