I'm trying to access C_DUDX, C_DUDY, etc from within a UDF. I have worked out that if I try to use these macros straight after loading a case all I get is 0.0, but if I provoke Fluent into using the velocity derivative through the GUI (i.e. by clicking 'calculate' in the contour plot menu with dx-velocity/dx selected) then I get useful values.
Does anybody know how I can provoke Fluent to determine these values without me having to intervene through the GUI?
Also, does anybody know how C_DUDX and D_U_G differ?
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