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Gradient in UDF

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Old   September 1, 2006, 13:50
Default Gradient in UDF
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summer
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Hello, everyone. I would like to write a UDF which has the gradients of velocity. I apply axis-symmetry solver in order to get the solution of a pipe (similar to the example 1 in FLUENT document :laminar flow in pipe). Now I am confused that if I could get the right gradient of velocity in x direction when I use C_U_G. Should I consider the difference of Polar Coordinates amd Cartesian Coordinates? Thank you in advance.

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