diff --git a/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction b/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction
index 09354052..35fbdeab 100644
--- a/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction
+++ b/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction
@@ -58,18 +58,18 @@ model
 contactSearch
 {
     // method for broad search particle-particle
-    method         NBS;
+    method			NBS;
 
     // method for broad search particle-wall
-    wallMapping    cellMapping;
+    wallMapping		cellMapping;
 
     NBSInfo
     {
     // each 10 timesteps, update neighbor list
-    updateFrequency 10;
+    updateFrequency	10;
 
     // bounding box size to particle diameter (max)
-    sizeRatio   1.1;
+    sizeRatio	1.1;
     }
 
    cellMappingInfo