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How to calculate velocity at a interior surface?

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Old   March 23, 2012, 10:21
Default How to calculate velocity at a interior surface?
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Im trying to get the velocity at a certain surface by udf.
First I try to use
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?

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