From 7220084ddae1f4c6007f5111913cb7f87a794657 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 13 Aug 2026 13:11:05 +0200
Subject: Renaming velocity to momentum. for now

---
 .../schaefer_turek_durst_krause_rannbacher/sim.cpp | 226 +++++++++++++++++++++
 1 file changed, 226 insertions(+)
 create mode 100644 examples/schaefer_turek_durst_krause_rannbacher/sim.cpp

(limited to 'examples/schaefer_turek_durst_krause_rannbacher/sim.cpp')

diff --git a/examples/schaefer_turek_durst_krause_rannbacher/sim.cpp b/examples/schaefer_turek_durst_krause_rannbacher/sim.cpp
new file mode 100644
index 0000000..c7f1014
--- /dev/null
+++ b/examples/schaefer_turek_durst_krause_rannbacher/sim.cpp
@@ -0,0 +1,226 @@
+#include "common.hpp"
+#include "init.hpp"
+#include "step.hpp"
+
+#include <forstio/codec/args.hpp>
+
+/**
+ * For deciding what parameters to use maybe?
+ */
+namespace args {
+using namespace saw::schema;
+
+using LbmArgsStruct = Struct<
+	Member<String, "coupling">
+>;
+
+using LbmArgs = Args<
+	LbmArgsStruct,
+	Tuple<>
+>;
+}
+
+template<typename T, typename Desc, typename Coll>
+saw::error_or<void> lbm_main(const saw::data<args::LbmArgs>& args){
+	using namespace kel::lbm;
+
+	auto& an = args.template get<"args">();
+
+	using dfi = df_info<T,Desc>;
+
+	auto eo_lbm_dir = output_directory();
+	if(eo_lbm_dir.is_error()){
+		return std::move(eo_lbm_dir.get_error());
+	}
+	auto& lbm_dir = eo_lbm_dir.get_value();
+
+	auto out_dir = lbm_dir / "stdkr_2d_gpu" / an.template get<"coupling">().stl_view();
+
+	{
+		std::error_code ec;
+		std::filesystem::create_directories(out_dir,ec);
+		if(ec != std::errc{}){
+			return saw::make_error<saw::err::critical>("Could not create output directory");
+		}
+	}
+
+	converter<T> conv {
+		// delta_x
+		{{1.0}},
+		// delta_t
+		{{1.0}}
+	};
+	
+	print_lbm_meta<T,Desc>(conv,{0.1},{1e-4},{0.4 * dim_y});
+
+	// 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;
+
+	auto eo_aio = saw::setup_async_io();
+	if(eo_aio.is_error()){
+		return std::move(eo_aio.get_error());
+	}
+	auto& aio = eo_aio.get_value();
+	saw::wait_scope wait{aio.event_loop};
+
+	bool krun = true;
+	bool print_status = false;
+	aio.event_port.on_signal(saw::Signal::Terminate).then([&](){
+		krun = false;
+	}).detach();
+	aio.event_port.on_signal(saw::Signal::User1).then([&](){
+		print_status = true;
+	}).detach();
+
+	device dev;
+
+	auto& sycl_q = dev.get_handle();
+
+	sycl_q.wait();
+	{
+		auto eov = init<T,Desc,Coll>(conv,*lbm_data_ptr,*lbm_macro_data_ptr,*lbm_particle_data_ptr);
+		if(eov.is_error()){
+			return eov;
+		}
+	}
+	{
+		auto eov = write_vtk_file(out_dir,"initial_state",0u,*lbm_data_ptr);
+		if(eov.is_error()){
+			return eov;
+		}
+	}
+
+	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();
+
+	{
+		auto eov = dev.copy_to_device(*lbm_data_ptr,lbm_sycl_data);
+		if(eov.is_error()){
+			return eov;
+		}
+	}
+	{
+		auto eov = dev.copy_to_device(*lbm_macro_data_ptr,lbm_sycl_macro_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};
+
+	auto& info_f = lsd_view.template get<"info">();
+
+	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);
+			if(eov.is_error()){
+				return eov;
+			}
+		}
+
+		sycl_q.wait();
+		if(i.get() % 64u == 0u){
+			{
+				auto eov = dev.copy_to_host(lbm_sycl_macro_data,*lbm_macro_data_ptr);
+				if(eov.is_error()){
+					return eov;
+				}
+			}
+			{
+				auto eov = write_csv_file(out_dir,"m",i.get(), *lbm_macro_data_ptr);
+				if(eov.is_error()){
+					return eov;
+				}
+			}
+		}
+		// Stream
+		sycl_q.submit([&](acpp::sycl::handler& h){
+			component<T,Desc,cmpt::Stream,encode::Sycl<saw::encode::Native>> stream;
+
+			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).get();
+
+				if(info > 0u){
+					stream.apply(lsd_view,index,i);
+				}
+			});
+		}).wait();
+		wait.poll();
+
+		if(print_status){
+			std::cout<<"Status: "<<i.get()<<" of "<<time_steps.get()<<" - "<<(i.template cast_to<sch::Float64>().get() * 100 / time_steps.get())<<"%"<<std::endl;
+			print_status = false;
+		}
+		print_progress_bar(i.get(), time_steps.get()-1u);
+	}
+	// After Loop
+	sycl_q.wait();
+	{
+		auto eov = dev.copy_to_host(lbm_sycl_macro_data,*lbm_macro_data_ptr);
+		if(eov.is_error()){
+			return eov;
+		}
+	}
+	{
+		auto eov = write_vtk_file(out_dir,"m",time_steps.get(), *lbm_macro_data_ptr);
+		if(eov.is_error()){
+			return eov;
+		}
+	}
+
+	sycl_q.wait();
+	return saw::make_void();
+}
+
+using FloatT = kel::lbm::sch::Float32;
+using DescT = kel::lbm::sch::D2Q9;
+
+saw::error_or<void> k_main(int argc, char** argv){
+	using namespace kel::lbm;
+	
+	saw::data<args::LbmArgs> args;
+	{
+		auto eov = saw::parse_args(args,argc,argv);
+		return eov;
+	}
+	auto& an = args.template get<"args">();
+	auto& coupling = an.template get<"coupling">();
+
+	if(coupling.stl_view() == "hlbm"){
+		return lbm_main<FloatT,DescT,method::Hlbm>(args);
+	}
+
+	return saw::make_error<saw::err::critical>("Invalid coupling");
+}
+
+
+int main(int argc, char** argv){
+	auto eov = k_main(argc, argv);
+	if(eov.is_error()){
+		auto& err = eov.get_error();
+		std::cerr<<"[Error] "<<err.get_category();
+		auto err_msg = err.get_message();
+		if(err_msg.size() > 0u){
+			std::cerr<<" - "<<err_msg;
+		}
+		std::cerr<<std::endl;
+		return err.get_id();
+	}
+	return 0;
+}
-- 
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