tutorials/multiphaseEuler/LBend: Changed to use the faceMomentum p-U algorithm

This provides a smooth solution but it is not clear if this is more accurate
than running the cellMomentum p-U algorithm which generates complex transients
in the solution.

tutorials/multiphaseEuler/LBend/system/fvSolution

@@ -89,7 +89,7 @@ PIMPLE
     nCorrectors      1;
     nNonOrthogonalCorrectors 0;
 
-    faceMomentum        no;
+    faceMomentum        yes;
     VmDdtCorrection     no;
     dragCorrection      yes;
     partialElimination  no;