[Claudio2010]

Hi,

I am new to Ansys and CFX and I haven't been able to resolve this issue. I'm modelling flow through a cylindrical duct in which there is a cylindrical obstacle, leaving a small gap between the obstacle and walls of the duct for the fluid to flow thorugh. The duct radius is 25 mm, while the obstacle radius is 24.45 mm. Thus, the gap is only 0.55 mm wide. I'm having trouble meshing this geometry in Ansys.

Is there any way I can have greater control of the mesh inside the gap?

I was thinking, one option was to create a separate domain for the fluid in the gap, and limit the mesh element size in order to have a finer mesh there, and use fluid-fluid interfaces to connect that domain to the rest of the duct.

Does this sound right to you or would there be a better way to do it?