From 5dade743e7c1e6b0b6001b4265bf792f0b05f93a Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 19 Aug 2026 16:36:14 +0200
Subject: Dangling

---
 examples/stdkr_2d_bgk/step.hpp | 77 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 examples/stdkr_2d_bgk/step.hpp

(limited to 'examples/stdkr_2d_bgk/step.hpp')

diff --git a/examples/stdkr_2d_bgk/step.hpp b/examples/stdkr_2d_bgk/step.hpp
new file mode 100644
index 0000000..667f5a3
--- /dev/null
+++ b/examples/stdkr_2d_bgk/step.hpp
@@ -0,0 +1,77 @@
+#pragma once
+
+#include "common.hpp"
+
+namespace kel {
+namespace lbm {
+
+template<typename T, typename Desc, typename Coll>
+saw::error_or<void> step(
+		const converter<T>& conv,
+		saw::data<sch::Ptr<sch::ChunkStruct<T,Desc>>,encode::Sycl<saw::encode::Native>>& fields,
+		saw::data<sch::Ptr<sch::MacroStruct<T,Desc>>,encode::Sycl<saw::encode::Native>>& macros,
+		saw::data<sch::UInt64> t_i,
+		device& dev
+){
+	static constexpr saw::data<sch::UInt64> sub_steps{0u};
+
+	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};
+
+			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;
+				for(uint64_t i = 0u; i < Desc::D; ++i){
+					index.at({{i}}).set(idx[i]);
+				}
+
+				auto info = info_f.at(index);
+				
+				switch(info.get()){
+					case 0u:
+					break;
+					case 1u:
+						bb.apply(fields,index,t_i);
+					break;
+					case 2u:
+						collision.apply(fields,macros,index,t_i);
+						break;
+					case 3u:
+						{
+							component<T,Desc,cmpt::ZouHeVelocityX<true>,encode::Sycl<saw::encode::Native>> flow_in{
+								[&]() -> saw::data<sch::Vector<T,Desc::D>> {
+									saw::data<sch::Vector<T,Desc::D>> vel;
+									{
+										auto y_si = conv.meter_lbm_to_si(index.at({{1u}}).template cast_to<T>()).handle();
+										vel.at({{0u}}) = conv.velocity_si_to_lbm({{static_cast<typename saw::native_data_type<T>::type>((1.2 / 0.41) * y_si.get() - (1.2 / (0.41*0.41)) * y_si.get() * y_si.get())}}).handle();
+										vel.at({{1u}}) = 0.0f;
+									}
+									return vel;
+								}()
+							};
+							flow_in.apply(fields,index,t_i);
+						}
+						collision.apply(fields,macros,index,t_i);
+						break;
+					case 4u:
+						flow_out.apply(fields,index,t_i);
+						collision.apply(fields,macros,index,t_i);
+					break;
+					default:
+					break;
+				}
+			});
+		}).wait();
+	}
+
+	return saw::make_void();
+}
+
+}
+}
-- 
cgit v1.2.3


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/step.hpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'examples/stdkr_2d_bgk/step.hpp')

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;
-- 
cgit v1.2.3