From 913973eddf82a3566d7ea847c52b6324ffadf6af Mon Sep 17 00:00:00 2001
From: Ilian Kara-Mostefa <95044023+IlianCS@users.noreply.github.com>
Date: Fri, 5 May 2023 14:09:41 -0700
Subject: Change CartesianCKCAlgorithm.H (#3898)

---
 .../FiniteDifferenceAlgorithms/CartesianCKCAlgorithm.H                | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianCKCAlgorithm.H')

diff --git a/Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianCKCAlgorithm.H b/Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianCKCAlgorithm.H
index d7946c97e..e3af70a0d 100644
--- a/Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianCKCAlgorithm.H
+++ b/Source/FieldSolver/FiniteDifferenceSolver/FiniteDifferenceAlgorithms/CartesianCKCAlgorithm.H
@@ -105,7 +105,9 @@ struct CartesianCKCAlgorithm {
      * Compute the maximum timestep, for which the scheme remains stable
      * (Courant-Friedrichs-Levy limit) */
     static amrex::Real ComputeMaxDt ( amrex::Real const * const dx ) {
-#if (defined WARPX_DIM_XZ)
+#if (defined WARPX_DIM_1D_Z)
+            amrex::Real const delta_t = dx[0]/PhysConst::c;
+#elif (defined WARPX_DIM_XZ)
             // - In Cartesian 2D geometry: determined by the minimum cell size in all direction
             amrex::Real const delta_t = std::min( dx[0], dx[1] )/PhysConst::c;
 #else
-- 
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