Modelling of a non-buoyant vertical jet in waves and currents

作     者：徐振山 陈永平 陶建峰 潘毅 张长宽 李志伟 无

作者机构：State Key Laboratory of Hydrology-Water Resources and Hydraulic EngineeringHohai University College of HarborCoastal and Offshore EngineeringHohai University Department of Civil and Environmental EngineeringThe Hong Kong Polytechnic University 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2016年第28卷第5期

页      面：778-793页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foun-dation of China(Grant Nos.51379072,51109074) the Spe-cialized Research Fund for the Doctoral Program of Higher Education(Grant No.20120094110016) the 111 Project of the Ministry of Education and the State Administration of Foreign Experts Affairs,China(Grant No.B12032) the Fundame-ntal Research Funds for the Central Universities(Grant No.2014B02514) 

主　　题：large eddy simulation (LES) turbulent jet wave cross-flow wave and cross-flow coexisting 

摘      要：A generic numerical model using the large eddy simulation （LES） technique is developed to simulate a non-buoyant vertical jet in wave and/or current environments. The experimental data obtained in five different cases, i.e., one case of the jet in a wave only environment, two cases of the jet in a cross-flow only environment and two cases of the jet in a wave and cross-flow coexisting environment, are used to validate the model. The grid sensitivity tests are conducted based on four different grid systems and the results illustrate that the non-uniform grid system C （205x99x126 nodes with the minimum size of 1/10 jet diameter） is sufficiently fine for the modelling. The comparative study shows that the wave-current non-linear interaction should be taken into account at the inflow boundary while modelling the jet in wave and cross-flow coexisting environments. All numerical results agree well with the experimental data, showing that： （1） the jet under the influence of the wave action has a faster centerline velocity decay and a higher turbulence level than that in the stagnant ambience, meanwhile the ＂twin peaks＂ phenomenon exists on the cross-sectional velocity profiles, （2） the jet under a cross-flow scenario is deflected along the cross-flow with the node in the downstream, （3） the jet in wave and cross-flow coexisting environments has a flow structure of＂effluent clouds＂, which enhances the mixing of the jet with surrounding waters.