# UDF for moving mesh

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 February 26, 2011, 05:00 UDF for moving mesh #1 New Member   Karthikeshwaran Ramasany Join Date: Feb 2011 Location: chennai Posts: 4 Rep Power: 8 hai, am trying to write UDF in fluent for my rotor motion in the stator. I tried a lot but i cant can someone help me..... Rotor having the both translation and rotational motion in stator. the translation motion is in eccentric motion. the eccentricity-4.039mm The diameter of rotor is 39.878mm stator dia-40.428 My rotor center linear motion is controlled by equation: x=2*e*sin(theta) Where, eccentricity=e=4.078mm Angle of rotor rotation =theta Theta=w*t Angular motion of rotor=Nr=60 rpm. Angular velocity of rotor=w=2*Nr*pi/60 rad/s Initially the rotor center (0,0) is same as stator center (0,0). I consider first plane of rotor (or stator) as the initial plane. As we move from one end (or initial plane) along z-direction, stator center lies on z-axis. But the rotor center moves eccentrically inside stator. [Stator is twisted and having its axis on z-axis]. Rotor pitch (Pr) =1/2*stator pitch (Ps) or Pr=Ps/2 Assume, Time step=dt One rotor revolution takes 1/w seconds. Time step=dt Number of steps for a single revolution, N = (1/w)/dt After time dt, the rotor center will be at x1=2e*sin(w*dt) x1 is distance from the center (0,0). http://www.youtube.com/watch?v=12Wszv1wUMk In this link u can see the motion of rotor

 February 26, 2011, 08:47 #2 Senior Member     Amir Join Date: May 2009 Location: Montreal, QC Posts: 739 Blog Entries: 1 Rep Power: 16

 February 27, 2011, 10:27 thanks #3 New Member   Karthikeshwaran Ramasany Join Date: Feb 2011 Location: chennai Posts: 4 Rep Power: 8 thanks a lot.........

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