Hi Maria!
So for fluid flow simulations (simple incompressible flow) there is no need to define material as mentioned before as this has no influence on the fluid behavior except if let’s say you do CHT or Fluid-Structure Interaction where the material properties would be relevant.
Materials used for your type can only be Newtonian, Non-Newtonian or a Viscosity Model.
Regarding your question about the parameters. You simply choose a custom BC and make the adaption as seen below.
For the turbulent BC this article will help you out: Defining Turbulent Boundary Conditions
The parameter for the roughness I have shown in the picture above will be adapted for reference data that you have. That’s actually an iterative process where you check first if the roughness constant of 0.5 works, if not then adapt and re-run. Hope it makes sense so far.
All the best!
Jousef