Reply To: Fluid velocity in dpm_drag

[Rob]

I wonder if the cell isn't passed to the macro,  https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_udf/flu_udf_DPMDEFINE.html  Example 2.5.6.3 suggests you may need to tell the UDF about the cell, and thread: look for  cell = PP_CELL(p)   That may not fix the problem, but may get you a bit further.

Once you get it working please post the structure for others.