From db1a2b2e5c77342f74fb9f7566a3f37448e2f00c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Max=20L=C3=BCbke?= <mluebke@gfz-potsdam.de>
Date: Mon, 4 Dec 2023 09:11:29 +0100
Subject: [PATCH] fix: use maximum alpha for CFL condition

---
 include/tug/Simulation.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/tug/Simulation.hpp b/include/tug/Simulation.hpp
index 4c0f5c8..469b411 100644
--- a/include/tug/Simulation.hpp
+++ b/include/tug/Simulation.hpp
@@ -199,7 +199,7 @@ public:
         const T minDeltaSquare = std::min(deltaColSquare, deltaRowSquare);
 
         const T maxAlpha =
-            std::min(grid.getAlphaX().maxCoeff(), grid.getAlphaY().maxCoeff());
+            std::max(grid.getAlphaX().maxCoeff(), grid.getAlphaY().maxCoeff());
 
         cfl = minDeltaSquare / (4 * maxAlpha);
       }