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Gradient of variable through UDF

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Old   March 8, 2013, 03:45
Default Gradient of variable through UDF
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I am solving a scalar equation for one variable. The source term of which is having gradient term like \frac{\partial{u}}{\partial{x}}.
'u' is not axial velocity but it is obtained through algebraic equation which is again the function of x.
I need to discretize the equation through UDF. How can i do this?

Any comment.

Thank you
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