# Profile for dynamic mesh

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 February 12, 2006, 08:49 Profile for dynamic mesh #1 Giuseppe Guest   Posts: n/a Hello to all, Can someone tell me how can I impose a rotation around the C.G. point of a body with a profile, to use it as motion for the dynamic mesh? Thanks

 February 12, 2006, 11:04 Re: Profile for dynamic mesh #2 Javier Guest   Posts: n/a Amico Giuseppe, Are you trying to simulate the movement of a piston or a valve? Did you get to work the dynamic mesh?

 February 12, 2006, 13:21 Re: Profile for dynamic mesh #3 Giuseppe Guest   Posts: n/a No, I want to do rotate a section of a bluff body around its axis! Do you know how? Thanks

 February 12, 2006, 14:07 Re: Profile for dynamic mesh #4 Javier Guest   Posts: n/a Amico Giuseppe, to move a body you need to give the coordinates that the CG is going to pass by. All this must be done using a UDF. I recommend you to check the way the valves of a piston are moved. Ciao Ragazzo

 February 12, 2006, 14:59 Re: Profile for dynamic mesh #5 Giuseppe Guest   Posts: n/a Amico Javier, have you an example of UDF which defines the motion of C.G. point?

 February 12, 2006, 15:07 Re: Profile for dynamic mesh #6 thomas Guest   Posts: n/a Hi, For dynamic mesh you need first to "isolate" the zone in gambit, basically you define the zone and put non-comformal faces. If you use MRF instead of the dynamic you dont need the non-comformal face. Then in Fluent when you define the boundary you can define the rotation of the fluid-zone with MRF or Dynamic mesh. If you use non-comformal mesh you need to declare you interface-grid. Then if the profile of the rotation is not steady but variate with the time, you can write a UDF to define the angular speed. There is excellent tutorial about this that you should have a look at it. It is pretty simple to catch. Hope this help

 February 12, 2006, 15:33 Re: Profile for dynamic mesh #7 Giuseppe Guest   Posts: n/a Hello Thomas, I have to define a sinusoidal rotation which is function of the time. Can I do this using a profile? I have made this for the motion in X and Y directions...

 February 13, 2006, 00:45 Re: Profile for dynamic mesh #8 thomas Guest   Posts: n/a mabe using the DEFINE_CG_MOTION, but i dont know if it is working in sliding mesh !

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