hello,
i think you just have to add at the end of your dx file
something like:
...here are definitions of multigrid objects..
#
object "ALL" class group
member "U-Velocity" value "U-Field"
member "V-Velocity" value "V-Field"
member "Pressure" value "P-Field"
member "Stream Function" value "STREAMF-Field"
member "Vorticity" value "VORTICITY-Field"
#
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