diff --git a/tutorials/sphereGranFlow/binarySystemOfParticles/caseSetup/interaction b/tutorials/sphereGranFlow/binarySystemOfParticles/caseSetup/interaction
index a3a1dde7..5e5909e9 100755
--- a/tutorials/sphereGranFlow/binarySystemOfParticles/caseSetup/interaction
+++ b/tutorials/sphereGranFlow/binarySystemOfParticles/caseSetup/interaction
@@ -34,8 +34,8 @@ model
 
 contactSearch
 {
-   method         multiGridNBS;           // method for broad search particle-particle
-   wallMapping    cellMapping;   // method for broad search particle-wall 
+   method         multiGridNBS;       // method for broad search particle-particle
+   wallMapping    multiGridMapping;   // method for broad search particle-wall 
 
    multiGridNBSInfo
    {
@@ -43,10 +43,10 @@ contactSearch
       sizeRatio      1.1;        // bounding box size to particle diameter (max)
    }
 
-   cellMappingInfo
+   multiGridMappingInfo
    {
       updateFrequency 10;        // each 10 timesteps, update neighbor list  
       cellExtent     0.6;        // bounding box for particle-wall search (> 0.5)
    }
 
-}
\ No newline at end of file
+}