From 7e4d50062f0d5eec2f59d4113beedf282c3e2da4 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 26 Jun 2025 14:15:50 +0200
Subject: Fixed bug with forgotten DF change

---
 c++/collision.hpp      |  2 +-
 examples/cavity_2d.cpp | 23 +++--------------------
 2 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/c++/collision.hpp b/c++/collision.hpp
index c28ec21..d9eb2c0 100644
--- a/c++/collision.hpp
+++ b/c++/collision.hpp
@@ -50,7 +50,7 @@ public:
 
 		saw::data<T> rho;
 		saw::data<sch::FixedArray<T,Descriptor::D>> vel;
-		compute_rho_u<T,Descriptor>(dfs,rho,vel);
+		compute_rho_u<T,Descriptor>(dfs_old,rho,vel);
 		auto eq = equilibrium<T,Descriptor>(rho,vel);
 
 		for(uint64_t i = 0u; i < Descriptor::Q; ++i){
diff --git a/examples/cavity_2d.cpp b/examples/cavity_2d.cpp
index ca42894..2860674 100644
--- a/examples/cavity_2d.cpp
+++ b/examples/cavity_2d.cpp
@@ -259,18 +259,16 @@ void lbm_step(
 
 			switch(info({0u}).get()){
 				case 1u: {
-					coll.apply(latt, {{i,j}}, time_step+1u);
+					coll.apply(latt, {{i,j}}, time_step);
 					break;
 				}
 				case 2u: {
 					auto& df = even_step ? cell.template get<"dfs_old">() : cell.template get<"dfs">();
-					// bb_lid.apply(df);
+					bb_lid.apply(df);
 					break;
 				}
 				case 3u: {
-					auto& df = even_step ? cell.template get<"dfs_old">() : cell.template get<"dfs">();
-					// bb_two.apply(df);
-					// bb.apply(latt, {{i,j}}, time_step);
+					bb.apply(latt, {{i,j}}, time_step);
 					break;
 				}
 				default:
@@ -279,21 +277,6 @@ void lbm_step(
 		}
 	}
 
-	apply_for_cells([&](auto cell, size_t i, size_t j){
-		auto& info = cell.template get<"info">();
-
-		auto info_v = info({0u}).get();
-		switch(info_v){
-			case 3u: {
-				auto& df = even_step ? cell.template get<"dfs_old">() : cell.template get<"dfs">();
-				bb_two.apply(df);
-				break;
-			}
-			default:
-				break;
-		}
-	},latt);
-
 	// Stream
 	for(uint64_t i = 1u; (i+1u) < latt.template get_dim_size<0>().get(); ++i){
 		for(uint64_t j = 1u; (j+1u) < latt.template get_dim_size<1>().get(); ++j){
-- 
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