problem to calculate discharge mass flow

[..]This fix also computes a global vector of length 6. This vector can be accessed via "f_ID", where ID is the fix id. The first vector component is equal to the total mass which has crossed the mesh surface, the second vector component indicates the particle count. The third vector component is equal to the total mass which has crossed the mesh surface since the last output divived by the time since the last output (i.e., the mass flow rate), the fourth vector component indicates the particle count since the last output divived by the time since the last output (i.e., the number rate of particles). The fifth and sixth vector components are the deleted mass and the number of deleted particles. This vector can also be accessed by various output commands.


fix cad1 all mesh/surface file lid.stl type 2 scale 1
fix mass all massflow/mesh mesh cad1 vec_side 0 0 -1 count once
variable m equal f_mass[1]
variable c equal f_mass[2]
variable I equal f_mass[3]
fix out all print 1 "$m,$c,$I" screen yes file mass.csv title "m,c,I"