Error in particle count for surface integration in particle tracing for fluid flow

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In particle tracing for fluid flow. when I try to surface integrate or use accumulator function to find out no of particles. following error comes : Undefined Variable

  • Variable: part_count_sel
  • Geometry: geom1
  • Domain: 2 Failed to evaluate variable.
  • Variable: comp1.fpt.Nsel
  • Defined as: part_count_sel Failed to evaluate expression.
  • Expression: comp1.fpt.Nsel
  • Feature: Surface Average 1

how to correct this error



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