两相流模型在南海内孤立波与沙波相互作用中的应用  

Application of a two-phase flow model on interaction between internal solitary waves and sand waves in the South China Sea

作　　者：吴浩南 陈同庆[1] 张庆河[1] 李景远 WU Haonan;CHEN Tongqing;ZHANG Qinghe;LI Jingyuan(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学水利工程安全与仿真国家重点实验室,天津300072

出　　处：《海洋通报》2023年第3期314-324,共11页Marine Science Bulletin

基　　金：国家重点研发计划(2021YFB2601100);国家自然科学基金(51509183)。

摘　　要：为研究内孤立波与沙波的相互作用,本文对基于OpenFOAM的SedWaveFoam求解器进行改进,建立了内孤立波-泥沙运动欧拉两相流模型。在利用试验资料对模型进行验证的基础上,在南海北部典型代表性条件下,模拟分析了500 m水深位置沙波床面上内孤立波作用下的水动力变化和泥沙运动。结果表明,内孤立波逐渐离开沙波时,海底沙波背流面处出现与内孤立波背景流速反向的流速,在内孤立波导致的流场作用下,沙波床面上的泥沙悬起并运动到床面以上的水体中。振幅100 m的内孤立波可以导致床面以上14 m高的位置处出现约0.07 kg/m3的悬沙浓度。In order to investigate the interaction between internal solitary waves and sand waves,an Eulerian two-phase flow solver based on OpenFOAM,SedWaveFoam,is improved to develop a numerical model for internal solitary waves and sand transport.The developed model is validated against experimental data.Under typical representative conditions in the northern part of the South China Sea,hydrodynamics of internal solitary waves and sand transport above the seabed with sand waves at water depth of 500 m are simulated and analyzed.The results show that reverse velocity appears on the lee side of sand waves when internal solitary waves gradually pass by the sand wave.The sediment on the slope of sand waves is suspended into the water column near the seabed caused by internal solitary waves induced current.An internal solitary wave with an amplitude of 100 m can lead to a suspended sand concentration of about 0.07 kg/m3 at a position about 14 m above the seabed.

关 键 词：内孤立波 海底沙波 两相流 数值模拟 

分 类 号：P737.2[天文地球—海洋地质]