抄録
A numerical simulation method that can calculate open-channel flows in which the free surface partially or temporary overtops large obstacles on the bed has been constructed. The method can either be used as a direct numerical simulation or large eddy simulation (LES) with appropriate sub-grid models. The LES version has been verified in calculation of flow in collapsing water column and applied to an open-channel flow with an array of hemispherical objects on the otherwise smooth and flat bed. The details of the flow and the forces on the obstacles have been analyzed by the proposed method. The results show good results revealing the effects of the flow depth and the Froude number on the complex turbulent flow. It can be applied to simulating flows in real rivers with large rocks and boulders.
