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    • Henry's avatar
      Update headers · 92f9825a
      Henry authored
      92f9825a
    • Henry's avatar
      blockMesh: Add support for multi/sectional grading in a block · 7ec17dfd
      Henry authored
      Consider a block describing a channel with two opposite walls.
      Currently in order to grade the mesh towards the walls and have a
      uniform region in the centre the channel would need to be spit into 3
      blocks.  With the new multi/sectional grading this can be achieved in a
      single block e.g.
      
      blocks
      (
          hex (0 1 2 3 4 5 6 7) (20 60 20)
          simpleGrading
          (
              1
              ((0.2 0.3 4) (0.6 0.4 1) (0.2 0.3 0.25))
              1
          )
      );
      
      In this example the block is divided uniformly in the x and z -directions
      and split into three grading sections in the y-direction described by
      three triples:  ((0.2 0.3 4) (0.6 0.4 1) (0.2 0.3 0.25)).  Each of the
      grading sections is described by a triple consisting of the fraction of
      the block, the fraction of the divisions and the grading ratio (size of
      first division/size of last division).  Both the fraction of the block
      and the fraction of the divisions are normalized automatically so they
      can be specified scaled in anyway, e.g. as percentages:
      
      blocks
      (
          hex (0 1 2 3 4 5 6 7) (20 60 20)
          simpleGrading
          (
              1
              ((2 3 4) (6 4 1) (2 3 0.25))
              1
          )
      );
      
      and they need not sum to 1 or 100.
      
      This is very new functionality and not well tested but backward
      compatibility has been well tested so all existing blockMeshDicts should
      parse correctly.
      7ec17dfd