What are different turbulent inlet conditions in T-Junction pipe flows? These will have little effect on the result, provided that you set the inlet conditions sufficiently far upstream of the junction i.e. in comparison to the flow establishment length; in any case greater than 100 times the Hydraulic Radius. In these conditions, you may put uniform turbulent intensity at the inlet of the order of a few percent and a turbulent dissipation compatible with the pressure loss that would be calculated from the White-Colebrook formula for example.