diff --git a/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/g b/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/g
index d182180d9..037e3b47f 100644
--- a/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/g
+++ b/tutorials/multiphase/driftFluxFoam/ras/mixerVessel2D/constant/g
@@ -16,6 +16,6 @@ FoamFile
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 dimensions      [0 1 -2 0 0 0 0];
-value           (0 0 0);
+value           (0 -9.81 0);
 
 // ************************************************************************* //