From 5cd236287542b47016fe3c49aa56bb66d74c4ad7 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 20 Aug 2026 18:59:00 +0200
Subject: Feierabend

---
 examples/stdkr_2d_bgk/init.hpp | 46 ++++++++++++++++++++----------------------
 examples/stdkr_2d_bgk/sim.cpp  | 13 ++----------
 examples/stdkr_2d_bgk/step.hpp |  3 +--
 3 files changed, 25 insertions(+), 37 deletions(-)

(limited to 'examples/stdkr_2d_bgk')

diff --git a/examples/stdkr_2d_bgk/init.hpp b/examples/stdkr_2d_bgk/init.hpp
index abc2a26..3127c88 100644
--- a/examples/stdkr_2d_bgk/init.hpp
+++ b/examples/stdkr_2d_bgk/init.hpp
@@ -14,7 +14,6 @@ saw::error_or<void> init(
 	(void) conv;
 
 	auto& info_f = fields.template get<"info">();
-	auto& porous_f = macros.template get<"porosity">();
 	// Set everything as walls
 	iterator<Desc::D>::apply(
 		[&](auto& index){
@@ -57,13 +56,11 @@ saw::error_or<void> init(
 	auto& df_f = fields.template get<"dfs_old">();
 	auto& rho_f = macros.template get<"density">();
 	auto& vel_f = macros.template get<"momentum">();
-	auto& por_f = macros.template get<"porosity">();
 	
 	iterator<Desc::D>::apply(
 		[&](auto& index){
 			auto& df = df_f.at(index);
 			auto& rho = rho_f.at(index);
-			por_f.at(index).at({}) = {1};
 			rho.at({}) = {1};
 			auto& vel = vel_f.at(index);
 			auto eq = equilibrium<T,Desc>(rho,vel);
@@ -92,31 +89,32 @@ saw::error_or<void> init(
 		{{1u,1u}}
 	);
 
-	{
+	iterator<Desc::D>::apply(
+		[&](const auto& index){
+			auto& info = info_f.at(index);
+			saw::data<sch::Scalar<T>> radius_p;
+			radius_p.at({}).set(conv.meter_si_to_lbm({{0.05}}).handle().get());
+			saw::data<sch::Scalar<T>> dense_p;
+			dense_p.at({}).set(1);
 
-	}
-	{
-		saw::data<sch::Scalar<T>> radius_p;
-		radius_p.at({}).set(conv.meter_si_to_lbm({{0.05}}).handle().get());
-		std::cout<<"RADIUS: "<<radius_p.at({}).get()<<std::endl;
-		saw::data<sch::Scalar<T>> dense_p;
-		dense_p.at({}).set(1);
-		/*
-		auto& parts = particles.template get<"particles">();
+			saw::data<sch::Vector<T,Desc::D>> middle,ind_vec;
+			middle.at({{0u}}) = conv.meter_si_to_lbm({{0.16}}).handle();
+			middle.at({{1u}}) = conv.meter_si_to_lbm({{0.2}}).handle();
 
-		{
-			auto& p = parts.at({0u});
-			auto& prb = p.template get<"rigid_body">();
-			auto& p_pos = prb.template get<"position">();
-			auto& p_posold = prb.template get<"position_old">();
-			p_pos.at({{0u}}) = conv.meter_si_to_lbm({{0.16}}).handle();
-			p_pos.at({{1u}}) = conv.meter_si_to_lbm({{0.2}}).handle();
+			for(uint64_t i{0u}; i < Desc::D; ++i){
+				ind_vec.at({{i}}) = index.at({i}).template cast_to<T>();
+			}
 
-			p_posold = p_pos;
-		}
-		*/
-	}
+			auto dist = ind_vec - middle;
+			auto dist_2 = saw::math::dot(dist,dist);
 
+			if(dist_2.at({}) < radius_p.at({}) * radius_p.at({})){
+				info_f.at(index) = 1u;
+			}
+		},
+		{},// 0-index
+		df_f.get_dims()
+	);
 	return saw::make_void();
 }
 
diff --git a/examples/stdkr_2d_bgk/sim.cpp b/examples/stdkr_2d_bgk/sim.cpp
index 558a219..36147d5 100644
--- a/examples/stdkr_2d_bgk/sim.cpp
+++ b/examples/stdkr_2d_bgk/sim.cpp
@@ -56,7 +56,6 @@ saw::error_or<void> lbm_main(const saw::data<args::LbmArgs>& args){
 	// saw::data<sch::FixedArray<sch::UInt64,Desc::D>> meta{{dim_x,dim_y}};
 	auto lbm_data_ptr = saw::heap<saw::data<sch::ChunkStruct<T,Desc>>>();
 	auto lbm_macro_data_ptr = saw::heap<saw::data<sch::MacroStruct<T,Desc>>>();
-	auto lbm_particle_data_ptr = saw::heap<saw::data<sch::ParticleSpheroidGroup<T,Desc>>>();
 
 	std::cout<<"Estimated Bytes: "<<memory_estimate<sch::ChunkStruct<T,Desc>,sch::MacroStruct<T,Desc>>().get()<<std::endl;
 
@@ -82,7 +81,7 @@ saw::error_or<void> lbm_main(const saw::data<args::LbmArgs>& args){
 
 	sycl_q.wait();
 	{
-		auto eov = init<T,Desc,Coll>(conv,*lbm_data_ptr,*lbm_macro_data_ptr,*lbm_particle_data_ptr);
+		auto eov = init<T,Desc,Coll>(conv,*lbm_data_ptr,*lbm_macro_data_ptr);
 		if(eov.is_error()){
 			return eov;
 		}
@@ -96,7 +95,6 @@ saw::error_or<void> lbm_main(const saw::data<args::LbmArgs>& args){
 
 	saw::data<sch::ChunkStruct<T,Desc>, encode::Sycl<saw::encode::Native>> lbm_sycl_data{sycl_q};
 	saw::data<sch::MacroStruct<T,Desc>, encode::Sycl<saw::encode::Native>> lbm_sycl_macro_data{sycl_q};
-	saw::data<sch::ParticleSpheroidGroup<T,Desc>, encode::Sycl<saw::encode::Native>> lbm_sycl_particle_data{sycl_q};
 	sycl_q.wait();
 
 	{
@@ -111,16 +109,9 @@ saw::error_or<void> lbm_main(const saw::data<args::LbmArgs>& args){
 			return eov;
 		}
 	}
-	{
-		auto eov = dev.copy_to_device(*lbm_particle_data_ptr,lbm_sycl_particle_data);
-		if(eov.is_error()){
-			return eov;
-		}
-	}
 	sycl_q.wait();
 	auto lsd_view = make_view(lbm_sycl_data);
 	auto lsdm_view = make_view(lbm_sycl_macro_data);
-	auto lsdp_view = make_view(lbm_sycl_particle_data);
 	
 	saw::data<sch::UInt64> time_steps{64u*1024ul};
 
@@ -129,7 +120,7 @@ saw::error_or<void> lbm_main(const saw::data<args::LbmArgs>& args){
 	for(saw::data<sch::UInt64> i{0u}; i < time_steps and krun; ++i){
 		// BC + Collision
 		{
-			auto eov = step<T,Desc,Coll>(conv,lsd_view,lsdm_view,lsdp_view,i,dev);
+			auto eov = step<T,Desc,Coll>(conv,lsd_view,lsdm_view,i,dev);
 			if(eov.is_error()){
 				return eov;
 			}
diff --git a/examples/stdkr_2d_bgk/step.hpp b/examples/stdkr_2d_bgk/step.hpp
index 667f5a3..cbf9f43 100644
--- a/examples/stdkr_2d_bgk/step.hpp
+++ b/examples/stdkr_2d_bgk/step.hpp
@@ -17,13 +17,12 @@ saw::error_or<void> step(
 
 	auto& q = dev.get_handle();
 	auto& info_f = fields.template get<"info">();
-	auto& porous_f = macros.template get<"porosity">();
 
 	{
 		q.submit([&](acpp::sycl::handler& h){
 			component<T,Desc,cmpt::BGK,encode::Sycl<saw::encode::Native>> collision{1.0};
 			component<T,Desc,cmpt::BounceBack,encode::Sycl<saw::encode::Native>> bb;
-			component<T,Desc,cmpt::ZouHeHorizontal<false>,encode::Sycl<saw::encode::Native>> flow_out{1.0};
+			component<T,Desc,cmpt::ZouHePressureX<false>,encode::Sycl<saw::encode::Native>> flow_out{1.0};
 
 			h.parallel_for(acpp::sycl::range<Desc::D>{dim_x,dim_y}, [=](acpp::sycl::id<Desc::D> idx){
 				saw::data<sch::FixedArray<sch::UInt64,Desc::D>> index;
-- 
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