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