A COMUPUTAION METHOD FOR FLOW OVER HYDRAULIC STRUCTURES WITH LARGE WATER SURFACE DEFORMATIONS CONSIDERING GENERATION AND FLUX OF VORTICITY AT THE FREE SURFACE

Abstract

 Considering the dynamic boundary condisition at free surface (zero tangential stress) was the fundamental problem for applying the General Bottom Velocity Computation (GBVC) method to the flow over hydraulic structures with large water surface deformations. The zero tangential stress condition causes generation and flux of vorticity at the free surface. We formulated these processes and developed GBVC-FSV method. GBVC-FSV method was applied to the flow over a vertical sill. A comparison with the results of GBVC method indicates that GBVC-FSV can calculate the flows with large water surface deformations more stably.