STYLE: more consistent use of dimensioned Zero

- when constructing dimensioned fields that are to be zero-initialized,
  it is preferrable to use a form such as

      dimensionedScalar(dims, Zero)
      dimensionedVector(dims, Zero)

  rather than

      dimensionedScalar("0", dims, 0)
      dimensionedVector("zero", dims, vector::zero)

  This reduces clutter and also avoids any suggestion that the name of
  the dimensioned quantity has any influence on the field's name.

  An even shorter version is possible. Eg,

      dimensionedScalar(dims)

  but reduces the clarity of meaning.

- NB: UniformDimensionedField is an exception to these style changes
  since it does use the name of the dimensioned type (instead of the
  regIOobject).

applications/utilities/mesh/advanced/refinementLevel/refinementLevel.C

@@ -278,7 +278,7 @@ int main(int argc, char *argv[])
             IOobject::NO_WRITE
         ),
         fMesh,
-        dimensionedScalar("zero", dimless/dimTime, 0)
+        dimensionedScalar(dimless/dimTime, Zero)
     );
 
     // Set cell values

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/cellShapeControl/cellShapeControlMesh/cellShapeControlMesh.C

@@ -658,7 +658,7 @@ void Foam::cellShapeControlMesh::write() const
             IOobject::AUTO_WRITE
         ),
         pointMesh::New(mesh),
-        dimensionedScalar("zero", dimLength, scalar(0))
+        dimensionedScalar(dimLength, Zero)
     );
 
     triadIOField alignments

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/conformalVoronoiMeshIO.C

@@ -1113,7 +1113,7 @@ void Foam::conformalVoronoiMesh::writeCellSizes
                 IOobject::AUTO_WRITE
             ),
             mesh,
-            dimensionedScalar("cellSize", dimLength, 0),
+            dimensionedScalar(dimLength, Zero),
             zeroGradientFvPatchScalarField::typeName
         );
 
@@ -1139,7 +1139,7 @@ void Foam::conformalVoronoiMesh::writeCellSizes
         //         IOobject::AUTO_WRITE
         //     ),
         //     mesh,
-        //     dimensionedScalar("cellVolume", dimLength, 0),
+        //     dimensionedScalar(dimLength, Zero),
         //     zeroGradientFvPatchScalarField::typeName
         // );
 
@@ -1158,7 +1158,7 @@ void Foam::conformalVoronoiMesh::writeCellSizes
         //         IOobject::AUTO_WRITE
         //     ),
         //     mesh,
-        //     dimensionedScalar("cellVolume", dimVolume, 0),
+        //     dimensionedScalar(dimVolume, Zero),
         //     zeroGradientFvPatchScalarField::typeName
         // );
 
@@ -1177,7 +1177,7 @@ void Foam::conformalVoronoiMesh::writeCellSizes
         //         IOobject::AUTO_WRITE
         //     ),
         //     mesh,
-        //     dimensionedScalar("cellSize", dimLength, 0),
+        //     dimensionedScalar(dimLength, Zero),
         //     zeroGradientFvPatchScalarField::typeName
         // );
 
@@ -1223,7 +1223,7 @@ void Foam::conformalVoronoiMesh::writeCellSizes
     //             IOobject::AUTO_WRITE
     //         ),
     //         ptMesh,
-    //         dimensionedScalar("ptTargetCellSize", dimLength, 0),
+    //         dimensionedScalar(dimLength, Zero),
     //         pointPatchVectorField::calculatedType()
     //     );
 

applications/utilities/mesh/generation/foamyMesh/foamyHexMeshBackgroundMesh/foamyHexMeshBackgroundMesh.C

@@ -603,7 +603,7 @@ int main(int argc, char *argv[])
                 false
             ),
             fvm,
-            dimensionedScalar("zero", dimLength, 0)
+            dimensionedScalar(dimLength, Zero)
         );
 
         const searchableSurfaces& geometry = geometryToConformTo.geometry();
@@ -668,7 +668,7 @@ int main(int argc, char *argv[])
                 false
             ),
             pointMesh::New(fvm),
-            dimensionedScalar("zero", dimLength, 0)
+            dimensionedScalar(dimLength, Zero)
         );
         {
             scalarField pointDistSqr(fvm.nPoints(), -sqr(GREAT));

applications/utilities/mesh/manipulation/checkMesh/writeFields.C

@@ -115,7 +115,7 @@ void Foam::writeFields
                 IOobject::AUTO_WRITE
             ),
             mesh,
-            dimensionedScalar("angle", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             calculatedFvPatchScalarField::typeName
         );
         //- Take max
@@ -149,7 +149,7 @@ void Foam::writeFields
                 IOobject::AUTO_WRITE
             ),
             mesh,
-            dimensionedScalar("weight", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             calculatedFvPatchScalarField::typeName
         );
         //- Take min
@@ -190,7 +190,7 @@ void Foam::writeFields
                 IOobject::AUTO_WRITE
             ),
             mesh,
-            dimensionedScalar("skewness", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             calculatedFvPatchScalarField::typeName
         );
         //- Take max
@@ -217,7 +217,7 @@ void Foam::writeFields
                 false
             ),
             mesh,
-            dimensionedScalar("cellDeterminant", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             zeroGradientFvPatchScalarField::typeName
         );
         cellDeterminant.primitiveFieldRef() =
@@ -251,7 +251,7 @@ void Foam::writeFields
                 false
             ),
             mesh,
-            dimensionedScalar("aspectRatio", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             zeroGradientFvPatchScalarField::typeName
         );
 
@@ -290,7 +290,7 @@ void Foam::writeFields
                 false
             ),
             mesh,
-            dimensionedScalar("cellShapes", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             zeroGradientFvPatchScalarField::typeName
         );
         const cellShapeList& cellShapes = mesh.cellShapes();
@@ -319,7 +319,7 @@ void Foam::writeFields
                 false
             ),
             mesh,
-            dimensionedScalar("cellVolume", dimVolume, 0),
+            dimensionedScalar(dimVolume, Zero),
             calculatedFvPatchScalarField::typeName
         );
         V.ref() = mesh.V();
@@ -349,7 +349,7 @@ void Foam::writeFields
                 IOobject::AUTO_WRITE
             ),
             mesh,
-            dimensionedScalar("cellVolumeRatio", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             calculatedFvPatchScalarField::typeName
         );
         //- Take min
@@ -438,7 +438,7 @@ void Foam::writeFields
                 IOobject::AUTO_WRITE
             ),
             mesh,
-            dimensionedScalar("cellRegion", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             calculatedFvPatchScalarField::typeName
         );
 

applications/utilities/mesh/manipulation/renumberMesh/renumberMesh.C

@@ -85,7 +85,7 @@ tmp<volScalarField> createScalarField
                 false
             ),
             mesh,
-            dimensionedScalar("zero", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             zeroGradientFvPatchScalarField::typeName
         )
     );

applications/utilities/mesh/manipulation/splitMeshRegions/splitMeshRegions.C

@@ -1396,7 +1396,7 @@ void writeCellToRegion(const fvMesh& mesh, const labelList& cellRegion)
                 false
             ),
             mesh,
-            dimensionedScalar("zero", dimless, 0),
+            dimensionedScalar(dimless, Zero),
             zeroGradientFvPatchScalarField::typeName
         );
         forAll(cellRegion, celli)