# 2D modelling using CFX

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 February 26, 2008, 06:31 2D modelling using CFX #1 Wei-Haur Lam Guest   Posts: n/a Sponsored Links 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.

 February 26, 2008, 07:41 Re: 2D modelling using CFX #2 andy20 Guest   Posts: n/a Please see the FAQ for this forum: http://www.cfd-online.com/Wiki/Ansys...tion_in_CFX.3F Regards, Andy

 February 26, 2008, 08:54 Re: 2D modelling using CFX #3 kirby Guest   Posts: n/a you should generate one layer of mesh in the third direction. and you should not to solve the parameters of this direction.

 February 26, 2008, 09:50 Re: 2D modelling using CFX #4 Wei-Haur Lam Guest   Posts: n/a 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.

 February 26, 2008, 17:45 Re: 2D modelling using CFX #5 Glenn Horrocks Guest   Posts: n/a 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

 February 27, 2008, 14:04 Re: 2D modelling using CFX #6 Wei-Haur Lam Guest   Posts: n/a 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

 February 27, 2008, 17:52 Re: 2D modelling using CFX #7 Glenn Horrocks Guest   Posts: n/a Hi, Memory estimates for simulations is discussed in the CFX documentation. Glenn Horrocks

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