From a6d73e49cd17f1c55d4d4718c89df74ef0a03b41 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 2 Jul 2025 14:36:33 +0200
Subject: Moving to global equilibrium with proper types and introducing
 poiseulle

Slowly though
---
 c++/lbm.hpp               |  1 +
 examples/cavity_2d.cpp    | 19 ++++++++++---------
 examples/poiseulle_2d.cpp | 13 +++++++++++++
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/c++/lbm.hpp b/c++/lbm.hpp
index 3f46776..d331c6a 100644
--- a/c++/lbm.hpp
+++ b/c++/lbm.hpp
@@ -4,6 +4,7 @@
 #include "converter.hpp"
 #include "config.hpp"
 #include "component.hpp"
+#include "equilibrium.hpp"
 #include "write_vtk.hpp"
 
 #include <forstio/codec/unit/unit_print.hpp>
diff --git a/examples/cavity_2d.cpp b/examples/cavity_2d.cpp
index 6332bcf..c4a86d5 100644
--- a/examples/cavity_2d.cpp
+++ b/examples/cavity_2d.cpp
@@ -52,6 +52,7 @@ using MacroStruct = Struct<
 >;
 
 using CavityFieldD2Q9 = CellField<D2Q9, CellStruct<D2Q9>>;
+}
 
 
 /*
@@ -149,10 +150,10 @@ void set_geometry(saw::data<kel::lbm::sch::CavityFieldD2Q9>& latt){
 void set_initial_conditions(saw::data<kel::lbm::sch::CavityFieldD2Q9>& latt){
 	using namespace kel::lbm;
 	
-	typename saw::native_data_type<sch::T>::type rho = 1.0;
+	saw::data<sch::T> rho{1.0};
 	{
-		std::array<typename saw::native_data_type<sch::T>::type, sch::D2Q9::D> vel = {0.0, 0.0};
-		auto eq = equilibrium<sch::D2Q9>(rho, vel);
+		saw::data<sch::FixedArray<sch::T,sch::D2Q9::D>> vel{{0.0,0.0}};
+		auto eq = equilibrium<sch::T,sch::D2Q9>(rho, vel);
 
 		apply_for_cells([&eq](auto& cell, std::size_t i, std::size_t j){
 			(void) i;
@@ -161,15 +162,15 @@ void set_initial_conditions(saw::data<kel::lbm::sch::CavityFieldD2Q9>& latt){
 			auto& dfs_old = cell.template get<"dfs_old">();
 			auto info = cell.template get<"info">()(0u).get();
 			for(uint64_t k = 0; k < sch::D2Q9::Q; ++k){
-				dfs(k).set(eq[k]);
-				dfs_old(k).set(eq[k]);
+				dfs(k) = eq.at({k});
+				dfs_old(k) = eq.at({k});
 			}
 		}, latt);
 	}
 	
 	{
-		std::array<typename saw::native_data_type<sch::T>::type, sch::D2Q9::D> vel = {0.1, 0.0};
-		auto eq = equilibrium<sch::D2Q9>(rho, vel);
+		saw::data<sch::FixedArray<sch::T,sch::D2Q9::D>> vel{{0.1,0.0}};
+		auto eq = equilibrium<sch::T,sch::D2Q9>(rho, vel);
 
 		apply_for_cells([&eq](auto& cell, std::size_t i, std::size_t j){
 			(void) i;
@@ -179,8 +180,8 @@ void set_initial_conditions(saw::data<kel::lbm::sch::CavityFieldD2Q9>& latt){
 			auto info = cell.template get<"info">()(0u).get();
 			if(info == 2u){
 				for(uint64_t k = 0; k < sch::D2Q9::Q; ++k){
-					dfs(k).set(eq[k]);
-					dfs_old(k).set(eq[k]);
+					dfs(k) = eq.at({k});
+					dfs_old(k) = eq.at({k});
 				}
 			}
 		}, latt);
diff --git a/examples/poiseulle_2d.cpp b/examples/poiseulle_2d.cpp
index 2f60ffd..a0f2603 100644
--- a/examples/poiseulle_2d.cpp
+++ b/examples/poiseulle_2d.cpp
@@ -126,5 +126,18 @@ int main(int argc, char** argv){
 	saw::data<sch::FixedArray<sch::UInt64,sch::D2Q9::D>> dim{{1024, 128}};
 	saw::data<sch::CavityFieldD2Q9, saw::encode::Native> lattice{dim};
 
+	saw::data<sch::Array<sch::MacroStruct<sch::T,sch::D2Q9::D>,sch::D2Q9::D>> macros{dim};
+
+	for(uint64_t i = 0u; i < 256u; ++i){
+
+		{
+			std::string vtk_f_name{"tmp/poiseulle_2d_"};
+			vtk_f_name += std::to_string(i) + ".vtk";
+			write_vtk_file(vtk_f_name, macros);
+		}
+
+		lbm_step(lattice, even_step, step);
+	}
+
 	return 0;
 }
-- 
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