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fuction for ddt(n) which n is normal surface vector

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Old   April 11, 2011, 06:34
Default fuction for ddt(n) which n is normal surface vector
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Dear Foamers

I'm writing an acoustic code for dynamic mesh case in a centrifugal fan. I use turbDyMFoam with movingWallVelocity BC at blades.
In one of the terms of this code, ddt(n) is needed, witch n is the normal vector of the blade surfaces that move around. I know the functions for normal vector of the patches but for its time derivative I don't know how to calculate them.
Another question is, Is there any function that could calculate velocity of the faces of the blade (which use dynamic mesh dict and movingWallvelocity) ?!

Thank you
Mohammadreza Shetab
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