本文選題：海山 + 水平繞流　； 參考：《北京交通大學(xué)》2015年碩士論文

【摘要】：海山是海洋地貌的重要組成部分,其存在可對周圍海水的流動(dòng)產(chǎn)生極大的影響。當(dāng)海水流經(jīng)海山時(shí),一部分海水沿海山坡面流動(dòng)形成上升流與下降流,其余部分繞過海山形成水平繞流。文獻(xiàn)調(diào)研顯示對海山上升流與水平繞流的研究并不充分。進(jìn)一步深入研究海山附近的特有流動(dòng)現(xiàn)象以及分析相應(yīng)的動(dòng)力機(jī)制,不僅是對流體力學(xué)基礎(chǔ)理論知識(shí)的有益補(bǔ)充,也對海洋資源開發(fā)利用有現(xiàn)實(shí)意義。 本文利用數(shù)值模擬的方法研究了不同雷諾數(shù)下海山的水平繞流和上升流,給出了大量非浸沒海山和浸沒海山的模擬算例。通過觀察不同的雷諾數(shù)(Re)的算例發(fā)現(xiàn)：兩類海山的水平繞流流動(dòng)與均勻截面圓柱繞流有明顯的差異,海山水平繞流尾跡區(qū)渦脫落的流態(tài)和強(qiáng)度在垂直方向有明顯的變化,且依賴于雷諾數(shù)。值得注意的是,雖然浸沒海山頂部以上的流動(dòng)沒有海山的直接阻擋,但對頂部以上的流動(dòng)影響明顯,浸沒海山頂部以上的流動(dòng)仍然存在類似繞流尾跡區(qū)渦脫落的流動(dòng)現(xiàn)象。 數(shù)值模擬結(jié)果表明：對于多數(shù)計(jì)算工況,在海山斜壁面上存在清晰的上升流與下降流,且二者分界清楚。進(jìn)一步定量分析顯示,分界點(diǎn)的高度有與雷諾數(shù)的依賴關(guān)系,并分別給出了非浸沒海山和浸沒海山上升流與下降流分界點(diǎn)高度的擬合計(jì)算公式。此外,也對兩類海山的垂直流量進(jìn)行了定量分析,分別給出了兩類海山上升流強(qiáng)度(流量)對雷諾數(shù)依賴的擬合計(jì)算公式。 本研究完成了非浸沒海山和浸沒海山的上升流與水平繞流的初步試算,描述了兩類流動(dòng)的主要特征,分析了相應(yīng)的動(dòng)力機(jī)制,并獲得了計(jì)算上升流強(qiáng)度的定量關(guān)系式。然而,受時(shí)間所限,計(jì)算工況和算例還不充分,進(jìn)一步大規(guī)模計(jì)算以及系統(tǒng)的理論分析和測量驗(yàn)證應(yīng)該是后續(xù)工作的重點(diǎn)。
[Abstract]:Seamount is an important part of marine geomorphology, and its existence has great influence on the flow of sea water around it. When the sea water flows through the seamounts, a part of the sea water flows along the coastal hillside to form upwelling and descending currents, while the rest of the sea water flows around the seamounts to form a horizontal flow. Literature investigation shows that the study of seamounts upwelling and horizontal flow is not sufficient. It is not only a useful supplement to the basic theoretical knowledge of hydrodynamics, but also of practical significance to develop and utilize marine resources by further studying the peculiar flow phenomenon near seamounts and analyzing the corresponding dynamic mechanism. In this paper, the horizontal flow and upwelling of seamounts under different Reynolds numbers are studied by means of numerical simulation, and a large number of simulation examples of non-submerged seamounts and submerged seamounts are given. An example of different Reynolds number Re) shows that there is a significant difference between the horizontal flow around the seamounts and the flow around a circular cylinder with uniform section, and the flow pattern and intensity of vortex shedding in the wake region of the horizontal seamounts have obvious changes in the vertical direction. And depends on Reynolds number. It is worth noting that although the flow above the top of the seamounts is not directly blocked by the seamounts, the flow above the top of the seamounts is obviously affected, and the flow above the top of the seamounts is still similar to that of vortex shedding around the wake of the seamounts. The numerical simulation results show that there are clear upwelling and descending flows on the seamounts slope wall for most calculation conditions, and the boundary between the two is clear. Further quantitative analysis shows that the height of the boundary point is dependent on Reynolds number, and the fitting formulas for the height of the upwelling and descending seamounts are given, respectively. In addition, the vertical flow of two seamounts is quantitatively analyzed, and the fitting formulas for the dependence of the upwelling current intensity (discharge) on Reynolds number are given respectively. In this study, the preliminary calculation of upwelling and horizontal flow around unsubmerged seamounts and submerged seamounts has been completed, the main characteristics of the two flows have been described, the corresponding dynamic mechanism has been analyzed, and the quantitative relationship formula for calculating the upwelling intensity has been obtained. However, due to the limitation of time, the calculation conditions and examples are not sufficient. Further large-scale calculation, theoretical analysis and measurement verification of the system should be the focus of the follow-up work.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P731.2

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

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本文編號(hào)：1942146