help on separating laminar and trubulent region

Zhihua

I am wondering if Fluent would allow me to separate a domain into two part: one part is to be simulated by solving the laminar NS equations and the second part is a continous flow of the first part but I need to use a RANS model there. For example, for flow across a circular cylinder in the sub-critical regime, I wish to solve laminar equations in the front half of the cylinder but RANS in the rear half. Any experiences or suggestions?

Your help is highly appreciated!

Zhihua