BUG: snappyHexMesh with -decomposeParDict option (issue #265)

- only occurs in combination with distributedTriSurfaceMesh in snappy.

- workaround similar to that previously used for surfaceRedistributePar
  (issue #60).

Minor adjustment of incompressible motorBike tutorial to detect use of
distributedTriSurfaceMesh.

tutorials/incompressible/simpleFoam/motorBike/Allrun

@@ -4,7 +4,10 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Source tutorial run functions
 . $WM_PROJECT_DIR/bin/tools/RunFunctions
 
+# Alternative decomposeParDict name:
 decompDict="-decomposeParDict system/decomposeParDict.6"
+## Standard decomposeParDict name:
+# unset decompDict
 
 # copy motorbike surface from resources directory
 \cp $FOAM_TUTORIALS/resources/geometry/motorBike.obj.gz constant/triSurface/
@@ -13,6 +16,14 @@ runApplication surfaceFeatureExtract
 runApplication blockMesh
 
 runApplication decomposePar $decompDict
+
+# Using distributedTriSurfaceMesh?
+if foamDictionary -entry geometry -value system/snappyHexMeshDict | \
+   grep -q distributedTriSurfaceMesh
+then
+    runParallel $decompDict surfaceRedistributePar motorBike.obj independent
+fi
+
 runParallel $decompDict snappyHexMesh -overwrite
 
 #- For non-parallel running: - set the initial fields

tutorials/incompressible/simpleFoam/motorBike/system/decomposeParDict.6

@@ -15,20 +15,20 @@ FoamFile
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-numberOfSubdomains 4;
+numberOfSubdomains 6;
 
 method          hierarchical;
 // method          ptscotch;
 
 simpleCoeffs
 {
-    n               (4 1 1);
+    n               (6 1 1);
     delta           0.001;
 }
 
 hierarchicalCoeffs
 {
-    n               (2 2 1);
+    n               (3 2 1);
     delta           0.001;
     order           xyz;
 }