COMP: compile with single-precision

src/finiteVolume/fields/fvPatchFields/derived/surfaceNormalFixedValue/surfaceNormalFixedValueFvPatchVectorField.C

@@ -67,9 +67,9 @@ surfaceNormalFixedValueFvPatchVectorField
 )
 :
     fixedValueFvPatchVectorField(p, iF),
-    refValue_(ptf.refValue_, mapper, 0.0)
+    refValue_(ptf.refValue_, mapper, pTraits<scalar>::zero)
 {
-    // Note: refValue_ will have default value 0.0 for unmapped faces. This
+    // Note: refValue_ will have default value of 0 for unmapped faces. This
     // can temporarily happen during e.g. redistributePar. We should not
     // access ptf.patch() instead since redistributePar has destroyed this
     // at the time of mapping.