Author(s): Seongwook Choi; Sung-Uk Choi

Linked Author(s): Seongwook Choi

Keywords: Free jump; Submerged jump; Turbulence statistics; Embankment-type weir; Adverse pressure gradient; K-ω SST turbulence model

Abstract: This paper presents numerical simulations of the free jump and submerged jump over an embankment-type weir. The 2D unsteady Navier-Stokes equations are solved with the k- SST turbulence model. The volume of fluid method is used to compute the free surface and the water-air multiphase flow. The numerical model is validated against experimental data of both free jump and submerged jump. A free jump and three submerged jumps are reproduced for a fixed unit discharge. The mean flow and turbulence structures of the free jump and submerged jumps are obtained and their rate of longitudinal decay are estimated. The process of kinetic energy dissipation in the longitudinal direction is presented for the free jump and submerged jumps and discussions are made along with the longitudinal decay of the mean flow and turbulence structures.

DOI: https://doi.org/10.3850/IAHR-39WC2521711920221375

Year: 2022