|April 11, 2011, 06:34||
fuction for ddt(n) which n is normal surface vector
Join Date: Jul 2010
Posts: 49Rep Power: 8
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) ?!
|October 5, 2016, 08:14||
Join Date: Aug 2015
Location: Cologne, Germany
Posts: 10Rep Power: 3
Hello Foamers and Mohammadreza,
I have the same problem now and read many topics here in cfd-online.com, but did not found any solution. I hope for a hint, because my tryings were not successfully.
So how to calculate the surface normal velocity of a free design surface?
For example on the rotor in the picture which is uploaded here, the rotation vectors are shown. So the normal surface velocity on the x-y plane must be zero, because there is no moving in the direction of the surface normal.
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