I can't understand this comment in source code -- CFD Online Discussion Forums

July 7, 2015, 07:12	I can't understand this comment in source code	#1
d849c8 New Member xue Join Date: Mar 2015 Posts: 5 Rep Power: 11	Hello everyone, I want to use DPMFoam and I investigated how a particle rebounds when encountering walls: U = U(particle) - U(wall) U -=(1+e)(U&nw) However, I 'm confused about U(wall), U(wall) is from KinematicCloud.C, line 726, the comment there says "Only wall patches may have a non-zero wall velocity from the velocity field when the mesh is not moving." What does the comment mean?If the bottom of a pipe is wall, U(wall) shall be the velocity of fluid at bottom, though the bottom is not moving!I'm quite confused. Last edited by d849c8; July 7, 2015 at 21:28.*

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