2008 Volume 52 Pages 997-1002
A new numerical solver is developed for the quasi-3D river flow model to simulate meandering river flows. This solver can investigate the flows in the arbitrary curved river channel, by means of the adaptive CIP-Soroban (CIP-S) scheme in a cylindrical coordinate system with support of a boundary fitted coordinate (BFC) system. Time development of water velocity in the convection phase is computed by the orthogonal curvilinear coordinate system without any transformation of the governing equations, whereas the continuity equation is solved by the BFC method, so that the mass conservation is fully satisfied and the water level is accurately calculated. From the verification of this solver of the meandering river flows with the pure BFC method, it is shown that the proposed numerical solver reasonably predicts the main flow profile in a periodically curved open-channel, and that the horizontal velocity profile both at the free-surface and at the bottom is reasonably predicted with the effect of the secondary currents in the curved section of the river.
