NUMERICAL-SIMULATION OF HYDRAULIC JUMP

Hydraulic jump on a straight horizontal channel with supercritical Fro ude numbers 2-0 and 4.0 is numerically simulated by solving the Reynol ds averaged Navier-Stokes equations. Turbulence is modelled through th e k-epsilon closure equations and the mixed Eulerian-Lagrangian descri ption of flow is utilized to overcome the problem posed by moving free boundary. Time stepping is done via fractional step method and pressu re is determined from Poisson's equation. Galerkin finite element meth od with three-noded triangular elements is used for spatial discretiza tion. A detailed study of the internal and external characteristics of hydraulic jump is done and compared with experimental values where po ssible. Surface roller and recirculation wne are found to play a domin ant role in turbulence generation and dissipation.