Spinning cylinder in viscous liquid - a serious doubt -- CFD Online Discussion Forums

January 6, 2010, 02:21	Spinning cylinder in viscous liquid - a serious doubt	#1
doctsh Member s Kumar Join Date: Jul 2009 Posts: 50 Rep Power: 16	I have made a cylinder rotating about its axis in a highly viscous liquid (to mimic low reynolds no). according to theory,the cylinder has to move axially forward but in my CFD simulation it goes front and then come back... what could be the reason? I made a mesh as in the GMO sphere example and have given 6 DOF and prescribed rotational motion along cylindrical axis and coupled translational motion along cylndrical axis. other motions i made as prescribed and given 0. I have enabled GMO model and viscosity model. Is there anything wrong with this set up? Plz some one help me...

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