NUMERICAL-SIMULATION OF 2-DIMENSIONAL FLOW NEAR A SPUR-DIKE

Flow near a spur-dike is numerically simulated by solving the depth-av eraged, shallow water equations. An ADI implicit scheme and the MacCor mack explicit scheme, both second-order accurate in space and time, ar e employed. A packed grid is used in conjunction with the ADI scheme. Both no-slip and free-slip boundary conditions are applied at the wall s. For simplicity, a constant eddy viscosity model is used to close th e effective stresses. The eddy viscosity near the spur is determined a nd is assumed to exist throughout the entire flow held. The computed r esults compare favorably with experimental measurements. The results i ndicate that if the eddy viscosity can be estimated near the spur, the constant eddy viscosity model produces results similar to those obtai ned with more advanced turbulence models.