diff --git a/tutorials/cfdemSolverPimple/PeriodicBox/CFD/system/decomposeParDict b/tutorials/cfdemSolverPimple/PeriodicBox/CFD/system/decomposeParDict
index 1c30b447..e87404e3 100755
--- a/tutorials/cfdemSolverPimple/PeriodicBox/CFD/system/decomposeParDict
+++ b/tutorials/cfdemSolverPimple/PeriodicBox/CFD/system/decomposeParDict
@@ -21,7 +21,7 @@ method          simple;
 
 simpleCoeffs
 {
-    n           (8 4 1);
+    n           (4 2 4);
     delta       0.001;
 }