Abstract
Although some direct numerical simulations (DNS) are recently conducted for low Reynolds number flows, it is still difficult to calculate high Froude (Reynolds) number flows. At that time, a Reynolds stress model is very effective for calculating the turubulence structure near the free surface in steep open-channel flow. In this study, a numerical simulation was conducted by using Reynolds stress model at a new boundary condition of free surface including the effect of Froude number. Furthermore, the turbulent redistributions were mostly reproduced by modifying the pressure-strain term in steep open-channel flows. It became clear that the pressure-strain term affects greatly the turbulent redistributions near the free surface.
