fixes laminar plane flow config-file; adds exception for odd number of nodes

apps/cpu/LaminarPlaneFlow/LaminarPlaneFlow.cfg

 pathname = ./output/LaminarPlaneFlow
-numOfThreads = 18
+numOfThreads = 1
 blocknx = 16 16 1
-boundingBox = 32 32 1 
+boundingBox = 64 64 1 
 deltax = 1
 
-refineLevel = 0
+refineLevel = 1
 
 newStart    = true
 restartStep = 1000000
 
-cpStep      = 1000000
-cpStepStart = 1000000
+cpStep  = 1000000
+cpStart = 1000000
 outTime     = 10
 endTime     = 10

src/cpu/core/Visitors/SetInterpolationConnectorsBlockVisitor.cpp

@@ -59,6 +59,10 @@ void SetInterpolationConnectorsBlockVisitor::visit(SPtr<Grid3D> grid, SPtr<Block
 {
     if(!block) return;
 
+    UbTupleInt3 blockNX = grid->getBlockNX();
+    if (val<1>(blockNX) % 2 == 0 && val<2>(blockNX) % 2 == 0 && val<3>(blockNX) % 2 == 0)
+        UB_THROW(UbException(UB_EXARGS, "Odd number of nodes: The number of nodes in each dimension (x,y,z) has to be even."));
+
     UBLOG(logDEBUG5, "SetInterpolationConnectorsBlockVisitor::visit() - start");
     UBLOG(logDEBUG5, block->toString());