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full cell stencil with parallelisation

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Old   April 11, 2012, 14:51
Default full cell stencil with parallelisation
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Matthias Walter
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Hi,

I'm trying to get the cell centered values surrounding an arbitrary given cell in a certain volField, i.e. volVectorField U. First I have used a search algorithm that finds for a given cell all neighbour cells and returns the cell values but all in all, it's not working in parallel due to missing diagonal dependencies in the mesh.

Afterwards, I got a hint that the extendedStencil stuff could possibly be used for this. So I'm trying to make it work but ...hmm ... no success till now (especially not in parallel).

Code:
 CPCCellToCellStencil wideStencil(mesh());

 forAll(mesh().C(), lcellI)
 {
       const labelList& cell27Stencil=wideStencil[lcellI];
 
       forAll(cell27Stencil, cellI)
       {
          // now it becomes tricky ...

         // that's not working since the global addressing of the volField is wrong
         Pout << " center value: " << unFilteredField().[cell27Stencil[cellI]] << endl;
        
       }
  }
Furthermore I have no idea how to get correctly the values from the boundary fields (and processor patches) using the stencil stuff.

So I would be grateful for suggestions how to solve this messy problem! Maybe somebody has already done this or has some experience with the stencil stuff.


Best regards

Matthias
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Old   April 13, 2012, 11:48
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Kyle Mooney
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Hi Matthias,

While I don't have much experience in this matter, there is an extended stencil implementation of leastSquares here:

/OpenFOAM/OpenFOAM-1.6-ext/src/finiteVolume/lnInclude/extendedLeastSquaresVectors.C


You might be able to gain some insight if you haven't already checked it out.

Good luck,

Kyle
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