SPH numerical investigation of the characteristics of an oscillating hydraulic jump at an abrupt dro

• 作 者: Diana De Padova Michele Mossa Stefano Sibilla
• 机 构: Department of Civil, Environmental Land, Building Engineering and Chemistry, Polytechnic University
• 出 处: 水动力学研究与进展B辑
• 发表日期: 2018年1期
• 关键词: Hydraulic jumps smoothed particle hydrodynamics (SPH) models oscillating charact

This paper shows the results of the smooth particle hydrodynamics (SPH) modelling of the hydraulic jump at an abrupt drop,where the transition from supercritical to subcritical flow is characterised by several flow patts depending upon the inflow and tailwater conditions.SPH simulations are obtained by a pseudo-compressible XSPH scheme with pressure smoothing;turbulent stresses are represented either by an algebraic mixing-length model,or by a two-equation k-ε model.The numerical model is applied to analyse the occurrence of oscillatory flow conditions between two different jump types characterised by quasi-periodic oscillation,and the results are compared with experiments performed at the hydraulics laboratory of Bari Technical University.The purpose of this paper is to obtain a deeper understanding of the physical features of a flow which is in general difficult to be reproduced numerically,owing to its unstable character:in particular,vorticity and turbulent kinetic energy fields,velocity,water depth and pressure spectra downstream of the jump,and velocity and pressure cross-correlations can be computed and analysed.