From 377b6596a9cdfb62a261d2cba4c67be3e9d79244 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 6 Jul 2026 21:50:06 +0200
Subject: Fixing hlbm momentum and fixing the boundary conditions

---
 modules/core/c++/hlbm.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'modules/core/c++')

diff --git a/modules/core/c++/hlbm.hpp b/modules/core/c++/hlbm.hpp
index d57a2e7..9a89697 100644
--- a/modules/core/c++/hlbm.hpp
+++ b/modules/core/c++/hlbm.hpp
@@ -174,7 +174,7 @@ public:
 
 			uint64_t i_opp = dfi::opposite_index[i];
 
-			saw::data<T> dfs_added = dfs.at({i}) + dfs_old_f.at(n_ind_i).at({i_opp});
+			saw::data<T> dfs_added = dfs.at({i}) - dfs_old_f.at(n_ind_i).at({i_opp});
 			saw::data<sch::Scalar<T>> dfs_added_v;
 			dfs_added_v.at({}) = dfs_added;
 			auto ei_dfs = e_i * dfs_added_v;
-- 
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