Question about generating Porous Jumps

[rathim]

Hello, I am trying to simulate wind turbine performance without importing specific geometries by installing porous jump zones that reduce the velocity of the incoming flow. However, the goal is to see the wake development distance and everything, so I need the porous jump faces to be surrounded by freestream volume. 
I have tried making control volumes and imprinting faces, but the only times I can imprint faces is if the surfaces extend beyond the boundary of the solid being imprinted upon, which conflicts with my earlier requirements. 
So in a nutshell: I would like to have a large control volume with two surfaces inside that I can set up as porous jumps and alter the permeability and whatnot

 

If someone can provide tips or even a link to videos that might be useful, I would greatly appreciate that!

[Rob]

I'd use a cylinder of a "sensible" length to avoid over refinement of the mesh and make one or other end face the PJ. Hanging faces look OK in CAD but can cause complications in the meshing stages. 

[Rob]

And a colleague's comment, have a look at Virtual Blade Modeller in Fluent. Possibly with the incorrect spelling because the documentation team are in America...