From f5d88c1ae8948724f11d30c1c2af385cc093eed2 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 24 Aug 2026 19:02:51 +0200
Subject: Fixing FpLBM, because I messed up guo forcing

---
 .../schaefer_turek_durst_krause_rannbacher/sim.cpp |  2 +-
 .../step.hpp                                       | 23 ++++++++++++++++------
 2 files changed, 18 insertions(+), 7 deletions(-)

(limited to 'examples')

diff --git a/examples/schaefer_turek_durst_krause_rannbacher/sim.cpp b/examples/schaefer_turek_durst_krause_rannbacher/sim.cpp
index 4d015c9..ff6a43a 100644
--- a/examples/schaefer_turek_durst_krause_rannbacher/sim.cpp
+++ b/examples/schaefer_turek_durst_krause_rannbacher/sim.cpp
@@ -48,7 +48,7 @@ saw::error_or<void> lbm_main(const saw::data<args::LbmArgs>& args){
 		// delta_x
 		{{0.41 / dim_y}},
 		// delta_t
-		{{1.067e-4}}
+		{{1.067e-4 * 0.5}}
 	};
 	
 	print_lbm_meta<T,Desc>(conv,{1e-3},{1e-4},{0.5 * dim_y});
diff --git a/examples/schaefer_turek_durst_krause_rannbacher/step.hpp b/examples/schaefer_turek_durst_krause_rannbacher/step.hpp
index cbdfd10..9748ec8 100644
--- a/examples/schaefer_turek_durst_krause_rannbacher/step.hpp
+++ b/examples/schaefer_turek_durst_krause_rannbacher/step.hpp
@@ -8,6 +8,7 @@ namespace lbm {
 template<typename T, typename Desc, typename Coll>
 saw::error_or<void> step(
 		const converter<T>& conv,
+		const saw::data<sch::Scalar<T>>& tau,
 		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::Ptr<sch::ParticleSpheroidGroup<T,Desc>>,encode::Sycl<saw::encode::Native>>& particles,
@@ -48,7 +49,7 @@ saw::error_or<void> step(
 		}).wait();
 
 		q.submit([&](acpp::sycl::handler& h){
-			component<T,Desc,cmpt::Hlbm,encode::Sycl<saw::encode::Native>> collision{1.0};
+			component<T,Desc,cmpt::Hlbm,encode::Sycl<saw::encode::Native>> collision{0.75};
 			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};
 
@@ -74,9 +75,19 @@ saw::error_or<void> step(
 							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;
+									saw::data<T> scale;
+									{
+										scale.set([&](){
+											if(t_i.get() > 2048u){
+												return 1.0f;
+											}
+
+											return t_i.get() / 2048.0f;
+										}());
+									}
 									{
 										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({{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() * scale;
 										vel.at({{1u}}) = 0.0f;
 									}
 									return vel;
@@ -123,8 +134,8 @@ saw::error_or<void> step(
 
 		// auto coll_ev = 
 		q.submit([&](acpp::sycl::handler& h){
-			component<T,Desc,cmpt::BGK,encode::Sycl<saw::encode::Native>> bgk{1.0};
-			component<T,Desc,cmpt::FpLbm,encode::Sycl<saw::encode::Native>> collision{1.0};
+			component<T,Desc,cmpt::BGK,encode::Sycl<saw::encode::Native>> bgk{0.75};
+			component<T,Desc,cmpt::FpLbm,encode::Sycl<saw::encode::Native>> collision{0.75};
 			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};
 
@@ -199,8 +210,8 @@ saw::error_or<void> step(
 
 		// auto coll_ev = 
 		q.submit([&](acpp::sycl::handler& h){
-			component<T,Desc,cmpt::BGK,encode::Sycl<saw::encode::Native>> bgk{1.0};
-			component<T,Desc,cmpt::Psm,encode::Sycl<saw::encode::Native>> collision{1.0};
+			component<T,Desc,cmpt::BGK,encode::Sycl<saw::encode::Native>> bgk{0.75};
+			component<T,Desc,cmpt::Psm,encode::Sycl<saw::encode::Native>> collision{0.75};
 			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};
 
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