ENH: upgrade writeVTK function object -> vtkWrite function object

- user-selectable format (vtk or vtu, ascii or binary)
- dictionary syntax closer to ensightWrite
- tutorial example in windAroundBuildings

tutorials/incompressible/simpleFoam/motorBike/system/ensightWrite

@@ -10,8 +10,8 @@ ensightWrite
     // Fields to output (words or regex)
     fields  (U p "(k|epsilon|omega)");
 
-    writeControl writeTime;
-    writeIterval 1;
+    writeControl  writeTime;
+    writeInterval 1;
 }
 
 // ************************************************************************* //

tutorials/incompressible/simpleFoam/windAroundBuildings/system/controlDict

@@ -50,6 +50,8 @@ runTimeModifiable true;
 
 functions
 {
+    #include "vtkWrite"
 }
 
+
 // ************************************************************************* //

tutorials/incompressible/simpleFoam/windAroundBuildings/system/vtkWrite

@@ -0,0 +1,31 @@
+// -*- C++ -*-
+// Minimal example of using the vtkWrite function object.
+vtkWrite
+{
+    type    vtkWrite;
+    libs    ("libutilityFunctionObjects.so");
+    log     true;
+
+    // Fields to output (words or regex)
+    fields  (U p "(k|epsilon|omega)");
+
+    //- Output format (ascii | binary) - Default=binary
+    // format  binary;
+
+    //- Use legacy output format - Default=false
+    // legacy  false;
+
+    //- Output directory name - Default="VTK"
+    // directory       "VTK";
+
+    //- Write cell ids as field - Default=true
+    writeIds        false;
+
+    writeControl    writeTime;
+    writeInterval   1;
+
+    writeControl    timeStep;
+    writeInterval   25;
+}
+
+// ************************************************************************* //