DEFINE_CG_MOTION vs DEFINE_GRID_MOTION -- CFD Online Discussion Forums

August 28, 2012, 11:01	DEFINE_CG_MOTION vs DEFINE_GRID_MOTION	#1
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	I am trying to simulate the flapping motion of simple wing using a UDF. I came across two types of UDF's for the said purpose. I would like to know the difference between the two types and which one is better if we want to simulate flapping/pitching/twisting/rolling motion of the wing. Thanks in advance Regards

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