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June 30, 2013, 13:36	udf	#1
gashti New Member morteza hajati Join Date: Mar 2013 Posts: 6 Rep Power: 13	HI. i want to set slip velocity condition on walls and the formula is the maxwell-smoluchowski first order slip condition in this form: us-uw=((2-alfa)/alfa)landadu/dy so i need to have u gradient with respect of y on walls. is it possible to do this with writing "CELL" expression? thanks.

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