From 03bcbc83d1b6d45c4ccd65e8b0b54e49d12ba2c9 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 5 Feb 2026 19:01:53 +0100
Subject: Adding lambda for timesteps management and reduced dimensions

---
 examples/poiseulle_particles_2d_gpu/sim.cpp | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'examples/poiseulle_particles_2d_gpu/sim.cpp')

diff --git a/examples/poiseulle_particles_2d_gpu/sim.cpp b/examples/poiseulle_particles_2d_gpu/sim.cpp
index 305ef80..f9ee85b 100644
--- a/examples/poiseulle_particles_2d_gpu/sim.cpp
+++ b/examples/poiseulle_particles_2d_gpu/sim.cpp
@@ -7,8 +7,8 @@
 namespace kel {
 namespace lbm {
 
-constexpr uint64_t dim_x = 2048u;
-constexpr uint64_t dim_y = 1024u;
+constexpr uint64_t dim_x = 1024u;
+constexpr uint64_t dim_y = 512u;
 
 namespace sch {
 using namespace saw::schema;
@@ -119,7 +119,15 @@ saw::error_or<void> step(
 		// 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::BounceBack,encode::Sycl<saw::encode::Native>> bb;
-		component<T,Desc,cmpt::ZouHeHorizontal<true>,encode::Sycl<saw::encode::Native>> flow_in{1.01};
+		component<T,Desc,cmpt::ZouHeHorizontal<true>,encode::Sycl<saw::encode::Native>> flow_in{
+			[&](){
+				uint64_t target_t_i = 128u;
+				if(t_i.get() < target_t_i){
+					return 1.0 + (0.001 / target_t_i) * t_i.get();
+				}
+				return 1.001;
+			}()
+		};
 		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){
@@ -236,7 +244,7 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 		}
 	}
 	sycl_q.wait();
-	saw::data<sch::UInt64> time_steps{256ul};
+	saw::data<sch::UInt64> time_steps{512ul};
 
 	for(saw::data<sch::UInt64> i{0u}; i < time_steps; ++i){
 		{
-- 
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