TUT: updated sonicFoam case (see #677)

tutorials/compressible/sonicFoam/RAS/nacaAirfoil/Allrun

@@ -6,7 +6,7 @@ cd ${0%/*} || exit 1                        # Run from this directory
 runApplication star4ToFoam -scale 1 \
     $FOAM_TUTORIALS/resources/geometry/nacaAirfoil/nacaAirfoil
 
-# Symmetry plane -> empy
+# Symmetry plane -> empty
 sed -i -e 's/symmetry\([)]*;\)/empty\1/' constant/polyMesh/boundary
 
 # Don't need these extra files (from star4ToFoam conversion)

tutorials/compressible/sonicFoam/RAS/nacaAirfoil/system/fvSchemes

@@ -23,6 +23,7 @@ ddtSchemes
 gradSchemes
 {
     default         Gauss linear;
+    grad(U)         cellLimited Gauss linear 1;
 }
 
 divSchemes