海山三维分层流体的运动及动力

发布时间：2018-05-05 05:24

本文选题：海山 + 分层　；参考：《北京交通大学》2017年硕士论文

【摘要】：由于温度、盐度在垂向上的差异,自然界中的海洋是天然的分层流体。同陆地一样,海洋底部也具有不同的地质形态。海山是海洋地质形态中不可缺少的部分,其存在对海水的流动结构具有重要的影响,研究海山三维分层流动对人们认识海洋、开发海洋、利用海洋具有重要意义。本文利用数值模拟的方法研究了海山对海水上游结构及下游结构的影响,并通过大量工况的计算得出定性和定量的结论。通过对比不同雷诺数(Re)和分层强度(K)的算例发现:海水的垂向运动强弱依赖雷诺数和分层强度,并随雷诺数的提高显著增大,随分层强度的提高而显著降低。进一步的数值模拟结果显示,海山上游会出现明显的上升流。分层强度越低,上升流的分界点越容易在较低雷诺数下出现。通过定量分析获得了均质海水分界点高度的标度律。此外,本文根据对不同截面垂向流率的定量分析,对海山垂向流率与雷诺数的依赖关系进行了拟合。本文对均质海水和分层海水的三维海山绕流进行了试算,并对其上下游结构进行了定性、定量分析,但是仍然需要更多的理论分析、海上测量和实验室实验结果对文中的结论进行验证。
[Abstract]:Due to the vertical variation of temperature and salinity, the ocean in nature is a natural stratified fluid. Like land, the bottom of the ocean has different geological formations. Seamount is an indispensable part of marine geological form, and its existence has an important influence on the flow structure of sea water. It is of great significance to study the three-dimensional stratified flow of seamounts for people to understand the ocean, develop the ocean, and utilize the ocean. In this paper, the influence of seamounts on the upstream and downstream structures of seawater is studied by means of numerical simulation, and the qualitative and quantitative conclusions are obtained by calculating a large number of working conditions. It is found that the vertical motion of seawater depends on Reynolds number and delamination strength, and increases with the increase of Reynolds number, and decreases with the increase of delamination strength. Further numerical simulation results show that obvious upwelling will occur in the upper reaches of seamounts. The lower the delamination strength, the easier the separation point of upwelling appears at lower Reynolds number. The scaling law of the height of the boundary point of homogeneous seawater is obtained by quantitative analysis. In addition, according to the quantitative analysis of vertical flow rate of different sections, the dependence of vertical flow rate on Reynolds number of seamounts is fitted. In this paper, the three-dimensional seamount flow around homogeneous and stratified seawater is calculated, and its upstream and downstream structures are analyzed qualitatively and quantitatively, but more theoretical analysis is needed. The results of marine measurements and laboratory experiments are used to verify the conclusions in this paper.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O35

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