Simulation of a jet under the combined action of waves and currents using a momentum integral model
Wastewater is usually discharged into the sea in the form of jet,and its dilution process is the result of the interaction of jet,wave and tidal current.In this study,based on the reasonable assumptions,the governing equations are integrated to the form of ordinary differential equations.According to the hydrodynamic characterist-ics of the jet in the wavy current environment,the entrainment and drag force functions of the jet are introduced to close the governing equations,thus the integral model for the turbulent jet under the combined action of waves and currents is established.Through comparison and verification,it is confirmed that the integral model can accurately simulate the time average movement and dilution process of the near-field jet under the wavy current environment.It is found that compared with a pure current environment,the influence range of jet on the surrounding water is lar-ger than that in a wavy current environment,and the dilution capacity of jet can be remarkably enhanced by the wave effect.Based on the momentum integral simulation results,the empirical fitting formulas for the position of the jet cross-sectional trajectory line and the minimum dilution in the wavy current environment are established.The developed model could be served as an efficient and accurate tool to assess the environmental impacts of sub-marine outfalls on the surrounding waters.
combined wave and current environmentturbulent jetmomentum integral simulationjet trajectorydilution
万方数据
维普
