Author(s)

L. Yu, A.M Righetto & W.N.L. Roma

Abstract

In the paper, two recently developed numerical methods: hybrid grid method and nested method are briefly presented. These two methods were successfully adopted to simulate the real three- dimensional flows in a river and in an estuary, respectively. The hybrid grid system is composed of part orthogonal body-fitted curvilinear co-ordinates in horizontal plane and part Cartesians co- ordinate in the vertical direction. The orthogonal body-fitted co-ordinate (BFC) system exactly fits bank boundaries; the blockage coefficients approximate the bottom topography. This constructed curvilinear grid system can make the non-simplified governing equations and boundary conditions relatively simpler. The three-dimensional physical domain (x,

Keywords