Applied pairs in reduced dimension cases to represent the directions that are not solved, i.e.:

  • 1-D: sides of the 1-D stack of cells
  • 2-D: front and back planes


The condition requires entries in both the boundary and field files. Mesh boundary file:

    type            empty;

Field file:

    type            empty;


  • Separation between empty patch pairs must be
    • a single layer of cells
    • cells should be uniform thickness in the non-solved direction, and
    • points should appear collocated when viewed in the patch normal direction
  • Particles will be snapped to the mid-plane between pairs of empty patches

Further information

Source code:

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