From f50bf98a4a39dfcfb5ad2690d0adaa851d3dc69a Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 20 Apr 2025 19:13:16 +0200
Subject: Build conversion for basic types

---
 c++/converter.hpp      | 16 +++++++++++++++-
 c++/lbm.hpp            | 11 ++++++-----
 c++/lbm_unit.hpp       |  5 ++++-
 examples/cavity_2d.cpp |  2 +-
 examples/meta.cpp      |  5 +++++
 5 files changed, 31 insertions(+), 8 deletions(-)
 create mode 100644 examples/meta.cpp

diff --git a/c++/converter.hpp b/c++/converter.hpp
index 2ad5185..6e0a7a6 100644
--- a/c++/converter.hpp
+++ b/c++/converter.hpp
@@ -20,6 +20,20 @@ public:
 		second_conv_{second_conv__}
 	{}
 
+	/**
+	 * Get the conversion parameter with the conversion type
+	 */
+	auto conversion_x() const {
+		return meter_conv_;
+	}
+
+	/**
+	 * Get the conversion parameter with the conversion type
+	 */
+	auto conversion_t() const {
+		return second_conv_;
+	}
+
 	auto delta_x() const {
 		return meter_conv_*saw::data<sch::LbmMeter<T>>{1.0};
 	}
@@ -45,7 +59,7 @@ public:
 	}
 
 	saw::data<sch::LbmKinematicViscosity<T>> kinematic_viscosity_si_to_lbm (const saw::data<sch::SiKinematicViscosity<T>>& kin_si) const {
-		return kin_si * second_conv_ / (meter_conv_ * meter_conv_);
+		return kin_si / (meter_conv_ * meter_conv_) * second_conv_;
 	}
 };
 
diff --git a/c++/lbm.hpp b/c++/lbm.hpp
index ddfa948..9cd7296 100644
--- a/c++/lbm.hpp
+++ b/c++/lbm.hpp
@@ -8,15 +8,16 @@
 
 namespace kel {
 namespace lbm {
-template<typename T>
-void print_lbm_meta(const converter<T>& conv){
+template<typename T, typename Desc>
+void print_lbm_meta(const converter<T>& conv, const saw::data<sch::SiKinematicViscosity<T>>& kin_vis_si){
 	std::cout
 		<<"[LBM Meta]\n"
 		<<"==========\n"
 		<<"\n"
-		<<"Δx: "<<conv.delta_x()<<"\n"
-		<<"Δt: "<<conv.delta_t()<<"\n"
-		<<""
+		<<"Δx:     "<<conv.delta_x()<<"\n"
+		<<"Δt:     "<<conv.delta_t()<<"\n"
+		<<"KinVis: "<<kin_vis_si<<"\n"
+		<<"τ:      "<<(saw::data<typename saw::unit_division<sch::Scalar<T>, sch::LbmKinematicViscosity<T>>::Schema >{df_info<T,Desc>::inv_cs2} * conv.kinematic_viscosity_si_to_lbm(kin_vis_si) + saw::data<sch::Scalar<T>>{0.5})<<"\n"
 	;
 }
 }
diff --git a/c++/lbm_unit.hpp b/c++/lbm_unit.hpp
index e69323f..2d90652 100644
--- a/c++/lbm_unit.hpp
+++ b/c++/lbm_unit.hpp
@@ -1,4 +1,7 @@
 #pragma once
+	/**
+	 * Get the conversion parameter with the conversion type
+	 */
 
 #include <forstio/codec/unit/unit.hpp>
 
@@ -39,7 +42,7 @@ template<typename S>
 using LbmMeter = Unit<S, UnitElement<lbm_type::meter, 1>>;
 
 template<typename S>
-using SiSecond = Unit<S, UnitElement<si_type::meter, 1>>;
+using SiSecond = Unit<S, UnitElement<si_type::second, 1>>;
 
 template<typename S>
 using LbmSecond = Unit<S, UnitElement<lbm_type::second, 1>>;
diff --git a/examples/cavity_2d.cpp b/examples/cavity_2d.cpp
index f1e2f51..4df4f2b 100644
--- a/examples/cavity_2d.cpp
+++ b/examples/cavity_2d.cpp
@@ -377,7 +377,7 @@ int main(){
 		{0.1}
 	};
 
-	print_lbm_meta(conv);
+	print_lbm_meta<sch::T, sch::D2Q9>(conv, {1e-3});
 
 	//auto& df_field = lattices.at(0).template get<"dfs">();
 	//for(uint64_t i = 0; i < df_field.get_dim_size<0u>(); ++i){
diff --git a/examples/meta.cpp b/examples/meta.cpp
new file mode 100644
index 0000000..6bdc40d
--- /dev/null
+++ b/examples/meta.cpp
@@ -0,0 +1,5 @@
+#include "../c++/lbm.hpp"
+
+int main(int argc, char** argv){
+	return 0;
+}
-- 
cgit v1.2.3