ENH: support VTK output of uniform field

src/conversion/vtk/output/foamVtkInternalWriter.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016-2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2016-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -214,6 +214,10 @@ public:
 
     // Write
 
+        //- Write a uniform field of Cell or Point values
+        template<class Type>
+        void writeUniform(const word& fieldName, const Type& val);
+
         //- Write point field
         //  Interpolate to originating cell centre for decomposed cells.
         template<class Type, template<class> class PatchField>

src/conversion/vtk/output/foamVtkInternalWriterTemplates.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2017-2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2017-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -30,6 +30,33 @@ License
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+template<class Type>
+void Foam::vtk::internalWriter::writeUniform
+(
+    const word& fieldName,
+    const Type& val
+)
+{
+    if (isState(outputState::CELL_DATA))
+    {
+        ++nCellData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfCells_);
+    }
+    else if (isState(outputState::POINT_DATA))
+    {
+        ++nPointData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfPoints_);
+    }
+    else
+    {
+        WarningInFunction
+            << "Ignore bad writer state (" << stateNames[state_]
+            << ") for field " << fieldName << nl << endl
+            << exit(FatalError);
+    }
+}
+
+
 template<class Type, template<class> class PatchField>
 void Foam::vtk::internalWriter::write
 (

src/conversion/vtk/output/foamVtkPatchWriter.H

@@ -233,6 +233,10 @@ public:
 
     // Write
 
+        //- Write a uniform field of Cell (Face) or Point values
+        template<class Type>
+        void writeUniform(const word& fieldName, const Type& val);
+
         //- Write point field
         template<class Type, template<class> class PatchField>
         void write

src/conversion/vtk/output/foamVtkPatchWriterTemplates.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016-2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2016-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -28,6 +28,33 @@ License
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+template<class Type>
+void Foam::vtk::patchWriter::writeUniform
+(
+    const word& fieldName,
+    const Type& val
+)
+{
+    if (isState(outputState::CELL_DATA))
+    {
+        ++nCellData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfCells_);
+    }
+    else if (isState(outputState::POINT_DATA))
+    {
+        ++nPointData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfPoints_);
+    }
+    else
+    {
+        WarningInFunction
+            << "Ignore bad writer state (" << stateNames[state_]
+            << ") for field " << fieldName << nl << endl
+            << exit(FatalError);
+    }
+}
+
+
 template<class Type, template<class> class PatchField>
 void Foam::vtk::patchWriter::write
 (

src/fileFormats/vtk/file/foamVtkFileWriter.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2018-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -126,6 +126,16 @@ protected:
         //- True if the output state does not correspond to the test state.
         inline bool notState(outputState test) const;
 
+        //- Write uniform field content.
+        //  No context checking (eg, file-open, CellData, PointData, etc)
+        template<class Type>
+        void writeUniform
+        (
+            const word& fieldName,
+            const Type& val,
+            const label nValues
+        );
+
 
         //- Trigger change state to Piece. Resets nCellData_, nPointData_.
         bool enter_Piece();
@@ -282,6 +292,10 @@ public:
 
 #include "foamVtkFileWriterI.H"
 
+#ifdef NoRepository
+    #include "foamVtkFileWriterTemplates.C"
+#endif
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 #endif

src/fileFormats/vtk/file/foamVtkFileWriterTemplates.C

@@ -0,0 +1,98 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include <type_traits>
+#include "foamVtkOutput.H"
+
+// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
+
+template<class Type>
+void Foam::vtk::fileWriter::writeUniform
+(
+    const word& fieldName,
+    const Type& val,
+    const label nValues
+)
+{
+    static_assert
+    (
+        (
+            std::is_same<label, typename pTraits<Type>::cmptType>::value
+         || std::is_floating_point<typename pTraits<Type>::cmptType>::value
+        ),
+        "Label and Floating-point vector space only"
+    );
+
+    const direction nCmpt(pTraits<Type>::nComponents);
+
+    if (format_)
+    {
+        if (std::is_same<label, typename pTraits<Type>::cmptType>::value)
+        {
+            if (legacy())
+            {
+                legacy::intField<nCmpt>(format(), fieldName, nValues);
+            }
+            else
+            {
+                const uint64_t payLoad = vtk::sizeofData<label, nCmpt>(nValues);
+
+                format().beginDataArray<label, nCmpt>(fieldName);
+                format().writeSize(payLoad);
+            }
+        }
+        else
+        {
+            if (legacy())
+            {
+                legacy::floatField<nCmpt>(format(), fieldName, nValues);
+            }
+            else
+            {
+                const uint64_t payLoad = vtk::sizeofData<float, nCmpt>(nValues);
+
+                format().beginDataArray<float, nCmpt>(fieldName);
+                format().writeSize(payLoad);
+            }
+        }
+    }
+
+    if (format_)
+    {
+        for (label i=0; i < nValues; ++i)
+        {
+            vtk::write(format(), val);
+        }
+    }
+
+    if (format_)
+    {
+        format().flush();
+        format().endDataArray();
+    }
+}
+
+
+// ************************************************************************* //

src/fileFormats/vtk/write/foamVtkSurfaceWriter.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2018-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -100,14 +100,14 @@ class surfaceWriter
         //- and begin piece
         void beginPiece();
 
-        //- Write patch points
+        //- Write points
         void writePoints();
 
-        //- Write patch faces, legacy format
+        //- Write faces, legacy format
         //  \param pointOffset processor-local point offset
         void writePolysLegacy(const label pointOffset);
 
-        //- Write patch faces
+        //- Write faces
         //  \param pointOffset processor-local point offset
         void writePolys(const label pointOffset);
 
@@ -212,6 +212,10 @@ public:
 
     // Write
 
+        //- Write a uniform field of Cell (Face) or Point values
+        template<class Type>
+        void writeUniform(const word& fieldName, const Type& val);
+
         //- Write a list of Cell (Face) or Point values
         template<class Type>
         void write(const word& fieldName, const UList<Type>& field);

src/fileFormats/vtk/write/foamVtkSurfaceWriterTemplates.C

@@ -25,6 +25,33 @@ License
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
+template<class Type>
+void Foam::vtk::surfaceWriter::writeUniform
+(
+    const word& fieldName,
+    const Type& val
+)
+{
+    if (isState(outputState::CELL_DATA))
+    {
+        ++nCellData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfCells_);
+    }
+    else if (isState(outputState::POINT_DATA))
+    {
+        ++nPointData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfPoints_);
+    }
+    else
+    {
+        WarningInFunction
+            << "Ignore bad writer state (" << stateNames[state_]
+            << ") for field " << fieldName << nl << endl
+            << exit(FatalError);
+    }
+}
+
+
 template<class Type>
 void Foam::vtk::surfaceWriter::write
 (

src/meshTools/output/foamVtkIndPatchWriter.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2018-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -195,6 +195,10 @@ public:
 
     // Write
 
+        //- Write a uniform field of Cell (Face) or Point values
+        template<class Type>
+        void writeUniform(const word& fieldName, const Type& val);
+
         //- Write a list of Cell (Face) or Point values
         template<class Type>
         void write(const word& fieldName, const UList<Type>& field);

src/meshTools/output/foamVtkIndPatchWriterTemplates.C

@@ -25,6 +25,34 @@ License
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
+
+template<class Type>
+void Foam::vtk::indirectPatchWriter::writeUniform
+(
+    const word& fieldName,
+    const Type& val
+)
+{
+    if (isState(outputState::CELL_DATA))
+    {
+        ++nCellData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfCells_);
+    }
+    else if (isState(outputState::POINT_DATA))
+    {
+        ++nPointData_;
+        vtk::fileWriter::writeUniform<Type>(fieldName, val, numberOfPoints_);
+    }
+    else
+    {
+        WarningInFunction
+            << "Bad writer state (" << stateNames[state_]
+            << ") for field " << fieldName << nl << endl
+            << exit(FatalError);
+    }
+}
+
+
 template<class Type>
 void Foam::vtk::indirectPatchWriter::write
 (