I´m trying to simulate a cylinder with another one inside interchanging air between them, but in cfx 5.5.1 I can´t do this because I´ve to create a empty solid.

Any suggest?

Carola

I can not figure out what you really want (intercahanging air??), but you can define two solids quite easily. The inner solid does not have to be empty: first define the outer cilinder as your solid domain and then the inner solid as a solid subdomain.

Astrid