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How to write udf of slip wall condition

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Old   April 27, 2005, 21:20
Default How to write udf of slip wall condition
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hello: i am computing a micronozzle, it's wall condition is slip,it is to say that the velocity of fluid on the wall is not zero. and fluent is need to acquire the shear stress of x and y component , so i should know the dU/dx or dU/dy. and the slip velocity is U=K*du/dx, here k is a constant, and du/dx and be know from udf Micros. My question is how can i know dU/dx after i know U(here U is present velocity and u is velocity of previous time step). and is there any other Micro in udf can finish my work?? thanks
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