From 9e37ff62b668694f705a8d132469f40ead9f6f0f Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 5 Jun 2025 13:09:07 +0200
Subject: Dangling changes

---
 examples/cavity_2d.cpp    | 30 +++++++----------
 examples/particle_ibm.cpp | 86 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+), 17 deletions(-)
 create mode 100644 examples/particle_ibm.cpp

(limited to 'examples')

diff --git a/examples/cavity_2d.cpp b/examples/cavity_2d.cpp
index d40e06e..a10276a 100644
--- a/examples/cavity_2d.cpp
+++ b/examples/cavity_2d.cpp
@@ -44,6 +44,11 @@ using CellStruct = Struct<
 	Member<CellInfo<Desc>, "info">
 >;
 
+template<typename T, uint64_t D>
+using MacroStruct = Struct<
+	Member<FixedArray<T,D>, "velocity">,
+	Member<T, "pressure">
+>;
 
 using CavityFieldD2Q9 = CellField<D2Q9, CellStruct<D2Q9>>;
 }
@@ -390,6 +395,8 @@ int main(){
 	uint64_t print_every = 256u;
 	uint64_t file_no = 0u;
 
+	saw::data<sch::Array<sch::MacroStruct<sch::T,sch::D2Q9::D>,sch::D2Q9::D>> macros{dim};
+
 	for(uint64_t step = 0; step < lattice_steps; ++step){
 
 		if(step % print_every == 0u){
@@ -481,28 +488,17 @@ int main(){
 			/// std::cout<<"Average rho: "<<(sum / ((dim_x-4)*(dim_y-4)))<<std::endl;
 			std::cout.flush();
 
-			std::ofstream vtk_file{"tmp/cavity_2d_"+std::to_string(file_no)+".vtk"};
-
-			vtk_file <<"# vtk DataFile Version 3.0\n";
-			vtk_file <<"Velocity Cavity2D example\n";
-			vtk_file <<"ASCII\n";
-			vtk_file <<"DATASET STRUCTURED_POINTS\n";
-			vtk_file <<"DIMENSIONS "<< dim_x <<" "<<dim_y<<" 1\n";
-			vtk_file <<"SPACING 1.0 1.0 1.0\n";
-			vtk_file <<"ORIGIN 0.0 0.0 0.0\n";
-			vtk_file <<"POINT_DATA "<<(dim_x*dim_y)<<"\n";
-			vtk_file <<"VECTORS Velocity float\n";
-			
 			apply_for_cells([&](auto& cell, std::size_t i, std::size_t j){
 				auto dfs = even_step ? cell.template get<"dfs_old">() : cell.template get<"dfs">();
 
-				typename saw::native_data_type<sch::T>::type rho;
-				std::array<typename saw::native_data_type<sch::T>::type, sch::D2Q9::D> vel;
+				auto& rho = macros.at({{i,j}}).template get<"pressure">();
+				auto& vel = macros.at({{i,j}}).template get<"velocity">();
 				compute_rho_u<sch::T,sch::D2Q9>(dfs,rho,vel);
-
-				vtk_file << static_cast<float>(vel[0u]) << " " << static_cast<float>(vel[1u])<<" 0.0\n";
 			}, lattice);
-			
+
+			std::string vtk_f_name{"tmp/cavity_2d_"};
+			vtk_f_name += std::to_string(file_no) + ".vtk";
+			write_vtk_file(vtk_f_name, macros);
 
 			++file_no;
 		}
diff --git a/examples/particle_ibm.cpp b/examples/particle_ibm.cpp
new file mode 100644
index 0000000..a2b510e
--- /dev/null
+++ b/examples/particle_ibm.cpp
@@ -0,0 +1,86 @@
+#include "../c++/descriptor.hpp"
+
+#include <forstio/codec/data.hpp>
+
+namespace kel {
+namespace lbm {
+namespace sch {
+using namespace saw::schema;
+
+/**
+ * Basic distribution function
+ * Base type
+ * D
+ * Q
+ * Scalar factor
+ * D factor
+ * Q factor
+ */
+using T = Float32;
+using D2Q5 = Descriptor<2,5>;
+using D2Q9 = Descriptor<2,9>;
+
+template<typename Desc>
+using DfCell = Cell<T, Desc, 0, 0, 1>;
+
+template<typename Desc>
+using CellInfo = Cell<UInt8, D2Q9, 1, 0, 0>;
+
+/**
+ * Basic type for simulation
+ */
+template<typename Desc>
+using CellStruct = Struct<
+	Member<DfCell<Desc>, "dfs">,
+	Member<DfCell<Desc>, "dfs_old">,
+	Member<CellInfo<Desc>, "info">,
+	Member<UInt8, "geometry">,
+	Member<UInt32, "particle">
+>;
+
+
+using CavityFieldD2Q9 = CellField<D2Q9, CellStruct<D2Q9>>;
+}
+}
+}
+
+int main(int argc, char** argv){
+	using namespace kel::lbm;
+
+	std::string_view cfg_file_name = "config.json";
+	if(argc > 1){
+		cfg_file_name = argv[1];
+	}
+
+	auto eo_conf = load_lbm_config<sch::Float64,sch::Descriptor<2,9>>(cfg_file_name);
+	if(eo_conf.is_error()){
+		auto& err = eo_conf.get_error();
+		std::cerr<<"[Error]: "<<err.get_category();
+		auto err_msg = err.get_message();
+		if(!err_msg.empty()){
+			std::cerr<<" - "<<err_msg;
+		}
+		std::cerr<<std::endl;
+
+		return err.get_id();
+	}
+
+	auto& conf = eo_conf.get_value();
+
+	converter<sch::Float64> conv{
+		{conf.template get<"delta_x">()},
+		{conf.template get<"delta_t">()}
+	};
+
+	print_lbm_meta<sch::Float64,sch::Descriptor<2,9>>(conv, {conf.template get<"kinematic_viscosity">()});
+
+
+	saw::data<sch::FixedArray<sch::UInt64,sch::D2Q9::D>> dim{{128, 128}};
+
+	saw::data<sch::CavityFieldD2Q9, saw::encode::Native> lattice{dim};
+
+
+
+
+	return 0;
+}
-- 
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