Can Fluent handle the transition from Laminar to Turbulent flow?

In real cases there could be a combination of both laminar and turbulent flow within the same problem. Can Fluent capture the transition?

The short answer is yes.  In Ansys Fluent, the transition from laminar to turbulent flow can be handled in a few ways. If you know the location of the transition point on an airfoil, you can create a laminar/turbulent transition boundary where the laminar cell zone borders the turbulent cell zone. This feature allows you to model turbulent transition on the airfoil. By default, the Laminar Zone option will set the turbulent viscosity to zero and disable turbulence production in the fluid zone. Turbulent quantities will still be transported through the zone, but effects on fluid mixing and momentum will be ignored [1]. URL: [1] https://ansyshelp.ansys.com/Views/Secured/corp/v232/en/flu_ug/flu_ug_bcs_sec_cell_zones.html

The transition from laminar to turbulent occurs at a Reynolds number of 2300 for internal flows. However, this number gives just an order of magnitude for transition since small perturbances in the flow and the surface conditions of the pipe can delay or anticipate the transition to turbulent flow [2]. URL: [2] https://www.youtube.com/embed/ZendPfazQfc?start=237&end=306