Abstract
Numerical calculation of unsteady open-channel flows was carried out using a low Reynolds number k-ε model, coupled with an anisotropic turbulence model, and VOF method. The distributions of ensemble averaged velocity, turbulence intensity, and Reynolds shear stress have been obtained in the whole flow region from the wall to the time-dependent free surface. The results of these calculations agree well with LDA database of Nezu et al. (1997, ASCE). Further, the turbulent energy budget in depth-varying unsteady flows, which is difficult to measure, has been calculated and discussed.
