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Old   February 26, 2008, 06:31
Default 2D modelling using CFX
  #1
Wei-Haur Lam
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I would like to model a Darriues wind turbine with straight blade. I am interested at the velocity field around the wind turbine and the wash at the downstream of wind turbine.

This case can be simplified to be a 2D case. However, according to the information I know, CFX does not provide a 2D modelling. Is this true? If it is, any alternatives to model this case in 2D?

Thanks.
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Old   February 26, 2008, 07:41
Default Re: 2D modelling using CFX
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andy20
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Please see the FAQ for this forum:

http://www.cfd-online.com/Wiki/Ansys...tion_in_CFX.3F

Regards, Andy
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Old   February 26, 2008, 08:54
Default Re: 2D modelling using CFX
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kirby
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you should generate one layer of mesh in the third direction. and you should not to solve the parameters of this direction.
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Old   February 26, 2008, 09:50
Default Re: 2D modelling using CFX
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Wei-Haur Lam
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The FAQ states,

"... For a 2D planar simulation this would be one element in the normal vector direction ... In CFX-Pre you should set the top and bottom faces of the extrusion as symmetry planes.."

I have extruded the mesh in the normal direction with one or few elements. In addition, I have set the top and bottom faces of the extrusion as symmetry planes. However, the changes of element in the normal direction provide different results. How to obtain a consistent result?

Thanks.
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Old   February 26, 2008, 17:45
Default Re: 2D modelling using CFX
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Glenn Horrocks
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Hi,

For a 2D planar simulation the extrusion in the normal direction is one element only, and the top and bottom faces must be parallel.

Glenn Horrocks
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Old   February 27, 2008, 14:04
Default Re: 2D modelling using CFX
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Wei-Haur Lam
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Hi Glenn,

Can I ask you a further question? If I would like to control the running time within a day for a rotating case using a sliding mesh method with fine time step (approximate 2 million cells), how much computational demand is required in term of number of processor and RAM for a computer cluster?

Thanks
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Old   February 27, 2008, 17:52
Default Re: 2D modelling using CFX
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Glenn Horrocks
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Hi,

Memory estimates for simulations is discussed in the CFX documentation.

Glenn Horrocks
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