I have been working on a transient simulation, using the SST k-w turbulence model in Fluent(TM). An unsteady boundary condition is used: at the beginning of the simulation the flow is laminar and gradually becomes turbulent.
This is where I am getting a bit confused. When describing the numerics of my model, should I give the Navier-Stokes equations (conservation,momentum and energy), RANS equations or URANS equations?
Are the equations used throughout the simulation or does the solver switch to them from NS only when the flow becomes turbulent? Would RANS work just fine in a laminar flow?