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-   -   2D modelling using CFX (http://www.cfd-online.com/Forums/cfx/25308-2d-modelling-using-cfx.html)

 Wei-Haur Lam February 26, 2008 06:31

2D modelling using CFX

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.

 andy20 February 26, 2008 07:41

Re: 2D modelling using CFX

Please see the FAQ for this forum:

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

Regards, Andy

 kirby February 26, 2008 08:54

Re: 2D modelling using CFX

you should generate one layer of mesh in the third direction. and you should not to solve the parameters of this direction.

 Wei-Haur Lam February 26, 2008 09:50

Re: 2D modelling using CFX

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.

 Glenn Horrocks February 26, 2008 17:45

Re: 2D modelling using CFX

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

 Wei-Haur Lam February 27, 2008 14:04

Re: 2D modelling using CFX

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

 Glenn Horrocks February 27, 2008 17:52

Re: 2D modelling using CFX

Hi,

Memory estimates for simulations is discussed in the CFX documentation.

Glenn Horrocks

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