From 507440cdf786f7a1a83bdf22371f1844910382fb Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 5 Mar 2026 20:04:09 +0100
Subject: Fixed ordering and somehow mistaking the wrongly assumed wrong
 pressure boundary

---
 examples/poiseulle_particles_2d_gpu/sim.cpp | 12 +++++++-----
 lib/core/c++/boundary.hpp                   |  4 ++--
 lib/core/tests/collision.cpp                |  6 ++++++
 3 files changed, 15 insertions(+), 7 deletions(-)
 create mode 100644 lib/core/tests/collision.cpp

diff --git a/examples/poiseulle_particles_2d_gpu/sim.cpp b/examples/poiseulle_particles_2d_gpu/sim.cpp
index bb81383..644e4d1 100644
--- a/examples/poiseulle_particles_2d_gpu/sim.cpp
+++ b/examples/poiseulle_particles_2d_gpu/sim.cpp
@@ -204,8 +204,8 @@ saw::error_or<void> step(
 	// auto coll_ev = 
 	q.submit([&](acpp::sycl::handler& h){
 		// Need nicer things to handle the flow. I see improvement here
-		// component<T,Desc,cmpt::BGK, encode::Sycl<saw::encode::Native>> collision{0.6};
-		component<T,Desc,cmpt::HLBM,encode::Sycl<saw::encode::Native>> collision{0.65};
+		component<T,Desc,cmpt::BGK, encode::Sycl<saw::encode::Native>> collision{0.65};
+		// component<T,Desc,cmpt::HLBM,encode::Sycl<saw::encode::Native>> collision{0.65};
 		// component<T,Desc,cmpt::PSM,encode::Sycl<saw::encode::Native>> collision{0.65};
 		component<T,Desc,cmpt::BounceBack,encode::Sycl<saw::encode::Native>> bb;
 
@@ -243,14 +243,14 @@ saw::error_or<void> step(
 					bb.apply(fields,index,t_i);
 				break;
 				case 2u:
-					flow_in.apply(fields,index,t_i);
 					collision.apply(fields,macros,index,t_i);
 					break;
 				case 3u:
-					flow_out.apply(fields,index,t_i);
+					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:
@@ -370,7 +370,7 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 		}
 	}
 	sycl_q.wait();
-	saw::data<sch::UInt64> time_steps{32ul};
+	saw::data<sch::UInt64> time_steps{4096ul};
 
 	auto& info_f = lsd_view.template get<"info">();
 
@@ -397,6 +397,7 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 				}
 			}
 		}
+		/*
 		{
 			{
 				auto eov = dev.copy_to_host(lbm_sycl_data,*lbm_data_ptr);
@@ -411,6 +412,7 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 				}
 			}
 		}
+		*/
 		// Stream
 		sycl_q.submit([&](acpp::sycl::handler& h){
 			component<T,Desc,cmpt::Stream,encode::Sycl<saw::encode::Native>> stream;
diff --git a/lib/core/c++/boundary.hpp b/lib/core/c++/boundary.hpp
index 0a4ff4d..d5f3022 100644
--- a/lib/core/c++/boundary.hpp
+++ b/lib/core/c++/boundary.hpp
@@ -135,7 +135,7 @@ public:
 		for(saw::data<sch::UInt64> k{0u}; k < saw::data<sch::UInt64>{Descriptor::Q}; ++k){
 			auto c_k = dfi::directions[k.get()];
 
-			if(c_k[0u]*known_dir >= 0){
+			if(c_k[0u]*known_dir <= 0){
 				sum_df += dfs_old.at({k});
 			}
 		}
@@ -147,7 +147,7 @@ public:
 
 		for(saw::data<sch::UInt64> k{0u}; k < saw::data<sch::UInt64>{Descriptor::Q}; ++k){
 			auto c_k = dfi::directions[k.get()];
-			if(c_k[0u]*known_dir > 0){
+			if(c_k[0u]*known_dir < 0){
 				sum_unknown_dfs += dfs_old.at({k}) * c_k[0u];
 			}
 		}
diff --git a/lib/core/tests/collision.cpp b/lib/core/tests/collision.cpp
new file mode 100644
index 0000000..cd53336
--- /dev/null
+++ b/lib/core/tests/collision.cpp
@@ -0,0 +1,6 @@
+#include <forstio/test/suite.hpp>
+
+#include "../c++/collision.hpp"
+
+namespace {
+}
-- 
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