# Grid Moving

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 February 19, 2005, 07:51 Grid Moving #1 Karthik Krishna Guest   Posts: n/a Sponsored Links Hai everybody, I am college student and doing a project in Grid motion. In a circular pipe (i.e. 2D), i want to rotate the inner side of the wall by 7degree in 1 sec. Outer Wall of the grid is fixed. My question: 1. It is possible in Fluent 6.0 using UDF by "DEFINE_GRID_MOTION" or "DEFINE_CG_MOTION" command. 2. I need to rotate the inner wall Grid (Nodes) for 7 degree. If any body knows How to do this Plz. help me. Thanks and regards, Karthik Krishna

 February 21, 2005, 04:23 Re: Grid Moving #2 HVN Guest   Posts: n/a Why don't you use mutiple reference frame method or sliding mesh method. It is explained in chapter 9 of the user's guide. HV

 February 23, 2005, 07:29 Re: Grid Moving #3 Karthik Krishna Guest   Posts: n/a Dear sir, I have tried in multiple reference frame and by sliding mesh method, but in my case i have to rotate the inner side of the cylinder by 7 degree only. In case of both MRF and sliding mesh method we can't maintain the rotation upto 7 DEGREE. I have studied the 9 TH chapter- It say we can do this option by using Dynamic mesh method. It say's we have to develop a program using UDF. My probem is to rotate the inner cylinder grid by 7 Degrees only. I am not very clear with the UDF's. If you could help me that will be a great information for me to solve my problem. Thanks and regards, Karthik Krishna

 February 23, 2005, 08:13 Re: Grid Moving #4 HVN Guest   Posts: n/a So now I understand what you try to simulate. Normally you could use for that the 2 udf that you speak about in your first message. HV

 February 23, 2005, 08:57 Re: Grid Moving #5 Karthik Krishna Guest   Posts: n/a Dear Sir, Yes, I am trying to simulate the inner cylinder grids using the 2 udf. But I am not very clear which to use for my Problem. If there is any sample problem, similar like my problem it will be very much useful. Thanks and regards, Karthik Krishna

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