Simulation of vertical round turbulent jets in shallow water

For studying the characteristics of jet in shallow water,the velocity distribution formulas of the vertical pure round jet in shallow water were proposed. When the free flow surface was tracked applying the volume of fluid(VOF) method,renormalization group(RNG) kinetic energy and dissipation rate(k-e) turbulent model was adopted,and a vertical pure round single-hole jet was simulated in still and uniformity shallow water.After the free surface position and velocity field distributions of different areas were researched,the data of RNG ke turbulent model,standard k-e turbulent model and the physical experimental model were compared.Results show that three variations of radial velocity distributions in free-surface jet area,axial velocity distributions in free jet area and in surface impinging area with water-surface elevation accord with normal distribution,and that axial velocity distribution of jet spout centerline accords with attenuation rate of half space.The RNG k-e turbulent model is more suitable for pure jet in shallow water than standard k-e turbulent model.