diff --git a/tutorials/cfdemSolverRhoPimpleChem/PolydisperseFluidizedBed/R2_FB/CFD/system/decomposeParDict b/tutorials/cfdemSolverRhoPimpleChem/PolydisperseFluidizedBed/R2_FB/CFD/system/decomposeParDict
index 7fe2c0f0..4a35b543 100644
--- a/tutorials/cfdemSolverRhoPimpleChem/PolydisperseFluidizedBed/R2_FB/CFD/system/decomposeParDict
+++ b/tutorials/cfdemSolverRhoPimpleChem/PolydisperseFluidizedBed/R2_FB/CFD/system/decomposeParDict
@@ -15,14 +15,14 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-numberOfSubdomains 8;
+numberOfSubdomains 4;
 
 //method          scotch;
 method simple;
 
 simpleCoeffs
 {
-    n               (2 2 2);
+    n               (2 1 2);
     delta           0.001;
 }