diff --git a/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/turbulenceProperties b/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/turbulenceProperties
index 02b27e15c4..21b5cf9ba5 100644
--- a/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/turbulenceProperties
+++ b/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/turbulenceProperties
@@ -19,10 +19,15 @@ simulationType  RAS;
 
 RAS
 {
-    RASModel kEpsilon;
+    RASModel buoyantKEpsilon;
 
     turbulence      on;
     printCoeffs     on;
+
+    buoyantKEpsilonCoeffs
+    {
+        Cg      0.85;
+    }
 }
 
 // ************************************************************************* //
diff --git a/tutorials/multiphase/driftFluxFoam/ras/tank3D/constant/turbulenceProperties b/tutorials/multiphase/driftFluxFoam/ras/tank3D/constant/turbulenceProperties
index 02b27e15c4..21b5cf9ba5 100644
--- a/tutorials/multiphase/driftFluxFoam/ras/tank3D/constant/turbulenceProperties
+++ b/tutorials/multiphase/driftFluxFoam/ras/tank3D/constant/turbulenceProperties
@@ -19,10 +19,15 @@ simulationType  RAS;
 
 RAS
 {
-    RASModel kEpsilon;
+    RASModel buoyantKEpsilon;
 
     turbulence      on;
     printCoeffs     on;
+
+    buoyantKEpsilonCoeffs
+    {
+        Cg      0.85;
+    }
 }
 
 // ************************************************************************* //