A numerical study of turbulent flow over a two-dimensional hill

Calculations of mean velocities and Reynolds stresses are reported for the recirculating flow established in the wake of two-dimensional polynomial-shaped obstacles that are symmetrical about a vertical axis and mounted in the water channel downstream of a fully developed channel flow for Re = 6 x 10 4 . The study involves calculations of mean and fluctuating flow properties in the streamwise and spanwise directions and include comparisons with experimental data [Almeida GP, Durao DFG, Heitor MV] for flow around a single obstacle with data resulting from the interaction of consecutive obstacles, using two versions of the low-Reynolds number differential second-moment (DSM) closure model. The results include analysis of the turbulent stresses in local flow co-ordinates and reveal flow structure qualitatively similar to that found in other turbulent flows with a reattachment zone