diff --git a/etc/bashrc b/etc/bashrc
index 9c425502..8b688347 100755
--- a/etc/bashrc
+++ b/etc/bashrc
@@ -17,7 +17,7 @@
 #------------------------------------------------------------------------------
 
 export CFDEM_PROJECT=CFDEM
-export CFDEM_VERSION=20.05
+export CFDEM_VERSION=20.09
 
 ################################################################################
 # USER EDITABLE PART: Changes made here may be lost with the next upgrade
diff --git a/etc/cshrc b/etc/cshrc
index e6d73425..35a8bae0 100755
--- a/etc/cshrc
+++ b/etc/cshrc
@@ -15,7 +15,7 @@
 #------------------------------------------------------------------------------
 
 setenv CFDEM_PROJECT CFDEM
-setenv CFDEM_VERSION 20.05
+setenv CFDEM_VERSION 20.09
 
 ################################################################################
 # USER EDITABLE PART: Changes made here may be lost with the next upgrade
diff --git a/src/lagrangian/cfdemParticle/cfdTools/versionInfo.H b/src/lagrangian/cfdemParticle/cfdTools/versionInfo.H
index 64c92d4e..f47b6142 100755
--- a/src/lagrangian/cfdemParticle/cfdTools/versionInfo.H
+++ b/src/lagrangian/cfdemParticle/cfdTools/versionInfo.H
@@ -34,8 +34,8 @@ Description
 #ifndef versionInfo_H
 #define versionInfo_H
 
-word CFDEMversion="PFM 20.05";
-word compatibleLIGGGHTSversion="PFM 20.05";
+word CFDEMversion="PFM 20.09";
+word compatibleLIGGGHTSversion="PFM 20.09";
 word OFversion="6";
 
 Info << "\nCFDEMcoupling version: " << CFDEMversion <<  endl;
diff --git a/tutorials/cfdemSolverPiso/voidfractionTest/DEM/post/.gitignore b/tutorials/cfdemSolverPiso/voidfractionTest/DEM/post/.gitignore
new file mode 100644
index 00000000..e69de29b
diff --git a/tutorials/cfdemSolverPiso/voidfractionTest/postrun.sh b/tutorials/cfdemSolverPiso/voidfractionTest/postrun.sh
new file mode 100755
index 00000000..2a474cc3
--- /dev/null
+++ b/tutorials/cfdemSolverPiso/voidfractionTest/postrun.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+# nothing to see here
\ No newline at end of file
diff --git a/tutorials/cfdemSolverPiso/voidfractionTest/prerun.sh b/tutorials/cfdemSolverPiso/voidfractionTest/prerun.sh
new file mode 100755
index 00000000..7b370ae7
--- /dev/null
+++ b/tutorials/cfdemSolverPiso/voidfractionTest/prerun.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+#- define variables
+casePath="$(dirname "$(readlink -f ${BASH_SOURCE[0]})")"
+
+# check if mesh was built
+if [ -f "$casePath/CFD/constant/polyMesh/boundary" ]; then
+    echo "mesh was built before - using old mesh"
+else
+    echo "mesh needs to be built"
+    cd $casePath/CFD
+    blockMesh
+fi
\ No newline at end of file
diff --git a/tutorials/cfdemSolverPiso/voidfractionTest/run.config b/tutorials/cfdemSolverPiso/voidfractionTest/run.config
new file mode 100644
index 00000000..793ad222
--- /dev/null
+++ b/tutorials/cfdemSolverPiso/voidfractionTest/run.config
@@ -0,0 +1,13 @@
+{
+  "type" : "CFDEMcoupling",
+  "runs" : [
+    {
+      "name" : "cfdemrun",
+      "solver" : "cfdemSolverPiso",
+      "type" : "CFDEMcoupling/mpi",
+      "nprocs" : 2,
+      "pre_scripts" : ["prerun.sh"],
+      "post_scripts" : ["postrun.sh"]
+    }
+  ]
+}