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Old   February 12, 2006, 08:49
Default Profile for dynamic mesh
  #1
Giuseppe
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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
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Old   February 12, 2006, 11:04
Default Re: Profile for dynamic mesh
  #2
Javier
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Amico Giuseppe, Are you trying to simulate the movement of a piston or a valve? Did you get to work the dynamic mesh?
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Old   February 12, 2006, 13:21
Default Re: Profile for dynamic mesh
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Giuseppe
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No, I want to do rotate a section of a bluff body around its axis! Do you know how? Thanks
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Old   February 12, 2006, 14:07
Default Re: Profile for dynamic mesh
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Javier
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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
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Old   February 12, 2006, 14:59
Default Re: Profile for dynamic mesh
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Giuseppe
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Amico Javier,

have you an example of UDF which defines the motion of C.G. point?
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Old   February 12, 2006, 15:07
Default Re: Profile for dynamic mesh
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thomas
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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

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Old   February 12, 2006, 15:33
Default Re: Profile for dynamic mesh
  #7
Giuseppe
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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...
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Old   February 13, 2006, 00:45
Default Re: Profile for dynamic mesh
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thomas
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mabe using the DEFINE_CG_MOTION, but i dont know if it is working in sliding mesh !
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