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.

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

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.

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.

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

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

Re: 2D modelling using CFX
 

Hi,

Memory estimates for simulations is discussed in the CFX documentation.

Glenn Horrocks