  mesh
   brick
    numz 8
      zblock 1 10.0 interval 6
      zblock 2 10.0 interval 6
      zblock 3 10.0 interval 6
      zblock 4 10.0 interval 6
      zblock 5 10.0 interval 6
      zblock 6 10.0 interval 6
      zblock 7 10.0 interval 6
      zblock 8 10.0 interval 6
    numx 3 initial radius 10.
      xblock 1 12. interval 12
      xblock 2 5. interval 6
      xblock 3 5. interval 12
    numy 5
      yblock 1 18. interval 18
      yblock 2 18. interval 18
      yblock 3 18. interval 18
      yblock 4 18. interval 18
      yblock 5 18. interval 18
    end
   set assign
      block sideset, klo, 11 4
      block sideset, khi, 12 4
      block sideset, klo, 21 5
      block sideset, khi, 22 5
      block sideset, klo, 31 6
      block sideset, khi, 32 6
      sideset,ilo,30
      sideset,ihi,20
    end
      decomposition strategy
      random
      end
  end

