Soheil Rostami - Ms.c Student, Department of Civil Eng, Institute of Gorgan Mirdamad Higher Education, Gorgan,Iran
Adel Asnaashari - Assistant Professor, Department of Civil Eng, Institute of Gorgan Mirdamad Higher Education,Gorgan, Iran

Junctions are generally used in water distribution networks, irrigation channels, sewage networks, water/wastewater treatment facilities, input to power generation facilities, and etc. Due to the flow complexity and also the effects of scale, physical models can not solely provide a clear understanding of the physics governing the flow field and it is necessary to study this phenomenon numerically along with field and experimental studies. At this study, the flow numerical simulation has been performed in a 900 Junction and Navier-Stokes equations are solved by Finite-Volume Method (FVM). The flow calculations were performed in the three dimensional model using different turbulence models. Flow velocity profiles at different sections of the main and lateral channels were compared with the experimental and numerical results of other researchers; and a good agreement has been found between them. The comparison of the obtained results with experimental and numerical results of other researchers indicates that this numerical method can well predict the flow velocity profiles in different sections of the Junction. Then, considering the good results obtained from previous sections, Froude number effect of the main and lateral channels entrance and diverted angles on flow separation zone, Secondary flow power and bed shear stress only as numerical was studied.

T-Junction, Flow field, Secondary flow, Finite-Volume Method, different turbulence model.