From 2b153a0e0263e5a76550b15382e2609f7b5a5d41 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 24 Aug 2026 17:15:52 +0200
Subject: Stuff

---
 modules/core/c++/fplbm.hpp | 105 +--------------------------------------------
 1 file changed, 2 insertions(+), 103 deletions(-)

(limited to 'modules/core/c++/fplbm.hpp')

diff --git a/modules/core/c++/fplbm.hpp b/modules/core/c++/fplbm.hpp
index 382d067..c9ed6e9 100644
--- a/modules/core/c++/fplbm.hpp
+++ b/modules/core/c++/fplbm.hpp
@@ -204,119 +204,18 @@ public:
 
 			// vel_s is technically time the density of the particle?
 
-			force = ( vel_s * rho - vel * rho ) /* two */ * flip_por;
+			force = ( vel_s * rho - vel * rho ) * two * flip_por;
 
 			force_p = force_p - force;
 		}, aabb.template get<"a">(), aabb.template get<"b">());
 
 		auto& pirb_acc = pirb.template get<"acceleration">();
-		pirb_acc = force_p / pg.template get<"total_mass">().at({});
+		pirb_acc = force_p / (two * pg.template get<"total_mass">().at({}));
 
 		for(saw::data<sch::UInt64> i{0u}; i < sub_steps; ++i){
 			verlet_step_lambda<T,Descriptor::D>(pi,sss);
 		}
 	}
 };
-
-template<typename T, typename Descriptor, typename Encode>
-class component<T, Descriptor, cmpt::FpLbmOneParticleNoVelocity, Encode> final {
-private:
-	saw::data<T> relaxation_;
-	saw::data<T> frequency_;
-public:
-	component(typename saw::native_data_type<T>::type relaxation__):
-		relaxation_{{relaxation__}},
-		frequency_{saw::data<T>{1} / relaxation_}
-	{}
-
-	component(const saw::data<T>& relaxation__):
-		relaxation_{relaxation__},
-		frequency_{saw::data<T>{1} / relaxation_}
-	{}
-
-	using Component = cmpt::FpLbmOneParticleNoVelocity;
-
-	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<"momentum">();
-		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);
-
-		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);
-
-		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_);
-		}
-	}
-
-};
 }
 }
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