INFLUENCE OF BOUNDARY CONDITIONS ON THE LARGE-SCALE STRUCTURES IN TURBULENT PLANE COUETTE FLOW

Two new sets of boundary conditions have been devised with the view to break the inflow−outflow coupling associated with periodic boundary conditions. This coupling is believed to play a significant role in the formation of large-scale structures found in numerically generated turbulent plane Couette flow. Direct numerical simulations are here performed in order to investigate the influence of the new boundary conditions on these large-scale structures. The effect of the boundary conditions was to shorten the streamwise lengthscale of the structures as well as reducing the inclination for roll cells to develop.