How to calculate velocity at a interior surface? -- CFD Online Discussion Forums

March 23, 2012, 10:21	How to calculate velocity at a interior surface?	#1
wanghaojie Member HJ Join Date: Nov 2011 Posts: 30 Rep Power: 14	Im trying to get the velocity at a certain surface by udf. First I try to use F_U(f,t) but when it runs, the fluent will stop and say there is an error. I further examined it and found out it can only be used for boundary surface Then i try to calculate the surface velocity by averaging the cells before and after the surface. Then i can get results but it is different from the contour result. I think the contour results is calculated by staggered grid? So how can i get exactly the same results as in the contour by udf? Thanks bawangdian and JamesCC like this.

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