From 79196db2ac3d31543056b3b7abe90ad609c51b4f Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Tue, 22 Sep 2026 09:27:15 +0200
Subject: Fixing two way coupling

---
 modules/core/c++/collision.hpp |  6 ++++++
 modules/core/c++/converter.hpp |  5 +++++
 modules/core/c++/fplbm.hpp     | 11 ++++++++---
 modules/core/c++/hlbm.hpp      |  5 +++++
 modules/core/c++/psm.hpp       |  5 +++++
 5 files changed, 29 insertions(+), 3 deletions(-)

(limited to 'modules/core/c++')

diff --git a/modules/core/c++/collision.hpp b/modules/core/c++/collision.hpp
index 39514b8..ec21b5f 100644
--- a/modules/core/c++/collision.hpp
+++ b/modules/core/c++/collision.hpp
@@ -4,6 +4,7 @@
 #include "component.hpp"
 #include "equilibrium.hpp"
 #include "chunk.hpp"
+#include "lbm_unit.hpp"
 
 namespace kel {
 namespace lbm {
@@ -31,6 +32,11 @@ public:
 		frequency_{saw::data<T>{1} / relaxation_}
 	{}
 
+	component(const saw::data<sch::Pure<T>>& relaxation__):
+		relaxation_{relaxation__.handle()},
+		frequency_{saw::data<T>{typename saw::native_data_type<T>::type(1)} / relaxation_}
+	{}
+
 	using Component = cmpt::BGK;
 
 	/**
diff --git a/modules/core/c++/converter.hpp b/modules/core/c++/converter.hpp
index 600db0d..3f0638b 100644
--- a/modules/core/c++/converter.hpp
+++ b/modules/core/c++/converter.hpp
@@ -86,6 +86,11 @@ public:
 	saw::data<sch::Pure<T>> kinematic_viscosity_si_to_tau(const saw::data<sch::SiKinematicViscosity<T>>& kin_si) const {
 		return saw::data<sch::Pure<T>>{saw::data<typename saw::unit_division<sch::Pure<T>, sch::LbmKinematicViscosity<T>>::Schema >{df_info<T,Desc>::inv_cs2} * kinematic_viscosity_si_to_lbm(kin_si) + saw::data<sch::Pure<T>>{0.5}};
 	}
+
+	template<typename Desc>
+	saw::data<sch::Pure<T>> kinematic_viscosity_lbm_to_tau(const saw::data<sch::LbmKinematicViscosity<T>>& kin_lbm) const {
+		return saw::data<sch::Pure<T>>{saw::data<typename saw::unit_division<sch::Pure<T>, sch::LbmKinematicViscosity<T>>::Schema >{df_info<T,Desc>::inv_cs2} * kin_lbm + saw::data<sch::Pure<T>>{0.5}};
+	}
 };
 }
 }
diff --git a/modules/core/c++/fplbm.hpp b/modules/core/c++/fplbm.hpp
index 0ab7903..d0cf023 100644
--- a/modules/core/c++/fplbm.hpp
+++ b/modules/core/c++/fplbm.hpp
@@ -60,6 +60,9 @@ private:
 	saw::data<T> relaxation_;
 	saw::data<T> frequency_;
 public:
+	using Component = cmpt::FpLbm;
+public:
+
 	component(typename saw::native_data_type<T>::type relaxation__):
 		relaxation_{{relaxation__}},
 		frequency_{saw::data<T>{1} / relaxation_}
@@ -70,8 +73,10 @@ public:
 		frequency_{saw::data<T>{1} / relaxation_}
 	{}
 
-	using Component = cmpt::FpLbm;
-
+	component(const saw::data<sch::Pure<T>>& relaxation__):
+		relaxation_{relaxation__.handle()},
+		frequency_{saw::data<T>{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 {
@@ -359,7 +364,7 @@ public:
 		}, 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 = global_force_ +  force_p / (pg.template get<"total_mass">().at({}));
 
 		for(saw::data<sch::UInt64> i{0u}; i < sub_steps; ++i){
 			verlet_step_lambda<T,Descriptor::D>(pi,one / sss);
diff --git a/modules/core/c++/hlbm.hpp b/modules/core/c++/hlbm.hpp
index 0df5896..fc61f6a 100644
--- a/modules/core/c++/hlbm.hpp
+++ b/modules/core/c++/hlbm.hpp
@@ -59,6 +59,11 @@ public:
 		frequency_{typename saw::native_data_type<T>::type(1) / relaxation_}
 	{}
 
+	component(const saw::data<sch::Pure<T>>& relaxation__):
+		relaxation_{relaxation__.handle().get()},
+		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,Desc::D>> index, saw::data<sch::UInt64> time_step) const {
 		
diff --git a/modules/core/c++/psm.hpp b/modules/core/c++/psm.hpp
index f5a8452..40323b3 100644
--- a/modules/core/c++/psm.hpp
+++ b/modules/core/c++/psm.hpp
@@ -48,6 +48,11 @@ public:
 		frequency_ = one / relaxation_;
 	}
 
+	component(const saw::data<sch::Pure<T>>& relaxation__):
+		relaxation_{relaxation__.handle()},
+		frequency_{saw::data<T>{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 {
 	
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