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udf: dimensionless wall coordinate

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Old   June 22, 2004, 06:10
Default udf: dimensionless wall coordinate
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I need to determine the dimensionless wall coordinate u+=u/u_tau from within an udf. The missing link is the friction velocity u_tau=sqrt(tau_w/rho). Obviously enough, the wall friction tau_w is only available for cells adjacent to a wall. While Fluent does know a macro which delivers the distance from a cell to the nearest wall, it lacks the possibility to specify which cell that would correspond to (at least I haven't found that possibility).

So, in short, my question is: Does anybody have an idea how to get a pointer to the nearest cell adjacent to a wall from any given cell inside the fluid thread?

regards, Chris
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