【摘要】：抗拖網(wǎng)海床基沙土基床沖刷是一個非常復雜的三維問題。抗拖網(wǎng)海床基是海底結構物的一種形式，目前國內外對海底結構物沙土基床沖刷機理已開展了一定研究，但要進行準確的分析預測需開展大量的工作。海底結構物沖刷的范圍和深度是海床基結構設計中的重要參考依據(jù)。國內外學者對海洋結構物沙土沖刷做了大量原型觀測、模型試驗和數(shù)值模擬的研究工作，得出了很多有關計算沖刷深度的經驗公式和半經驗半理論公式，這對海床基沙土基床沖刷的研究具有很重要的意義。隨著計算機硬件和CFD的發(fā)展，數(shù)值模擬以其獨特的優(yōu)勢在未來海床基沖刷的研究中發(fā)揮極其重要的作用。 本文采用FLUENT及FLOW-3D分別建立了抗拖網(wǎng)海床基的外部流場及沙土沖刷的三維數(shù)學模型，完成了外部流場和沙土基床沖刷的數(shù)值模擬。結果表明該數(shù)學模型能夠模擬抗拖網(wǎng)海床基周圍水流的流場形態(tài)和沖刷坑的變化情況。在模擬過程中，該數(shù)學模型形象直觀地反映了抗拖網(wǎng)海床基周圍的流場形態(tài)和漩渦體系，充分展現(xiàn)了沖刷坑的形成過程。此外，構成影響抗拖網(wǎng)海床基泥沙沖刷的因素主要有抗拖網(wǎng)海床基附近的水流條件和泥沙條件。本文通過改變水流流速和泥沙粒徑，，來模擬不同條件下對沙土基床沖刷的影響，并分析了抗拖網(wǎng)海床基最大沖刷深度隨這兩種因素改變的趨勢。結果表明，該模型可以預測抗拖網(wǎng)海床基沙土基床沖刷的范圍和深度，具有一定的實用性，對海床基長期布放后的儀器姿態(tài)預測具有重要意義，同時對海床基的結構設計具有一定的指導作用。
[Abstract]:It is a very complicated three-dimensional problem to resist scour of sand-soil base bed based on trawl seabed. The anti-trawl seabed base is a form of seabed structure. At present, some researches have been carried out on the erosion mechanism of sand and soil base bed of seabed structure at home and abroad, but a great deal of work is needed to carry out accurate analysis and prediction. The scour range and depth of seabed structure is an important reference in the design of seabed-based structure. Scholars at home and abroad have made a large number of prototype observations, model tests and numerical simulation of sand erosion of marine structures. Many empirical and semi-empirical semi-theoretical formulas for calculating scour depth have been obtained. This is of great significance to the study of the erosion of the seabed-based sand-soil bed. With the development of computer hardware and CFD, numerical simulation plays an important role in the study of seabed erosion in the future with its unique advantages. In this paper, FLUENT and FLOW-3D are used to establish three dimensional mathematical models of the external current field and sand erosion resistance of trawler seabed, and the numerical simulation of external current field and sand bed scour is completed. The results show that the mathematical model can simulate the flow pattern and scour pits around the trawl bed. In the process of simulation, the mathematical model vividly reflects the shape of the current field and the swirl system around the trawl bed, and fully shows the formation process of the scour pit. In addition, the main factors affecting the resistance to sediment erosion are the current and sediment conditions near the trawl bed. By changing the flow velocity and sediment particle size, this paper simulates the effect of different conditions on the sand bed erosion, and analyzes the trend of the maximum scour depth of the trawl seabed with these two factors. The results show that the model can predict the range and depth of sand bed erosion resistance to trawling seabed, and has some practicability, which is of great significance to the prediction of instrument attitude after long-term placement of seabed base. At the same time, it can guide the structure design of seabed.
【學位授予單位】：青島科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P754

【參考文獻】

相關期刊論文 前10條

1 毛寧;;論泥沙礫石的起動流速[J];長江科學院院報;2011年01期

2 李林普,張日向;波流作用下大直徑圓柱體基底周圍最大沖刷深度預測[J];大連理工大學學報;2003年05期

3 齊鵬,王永學;三維數(shù)值波浪水池技術與應用[J];大連理工大學學報;2003年06期

4 謝世楞;海上墩式建筑物周圍的沖刷問題[J];港工技術;1987年01期

5 孫寧松,孫永福,宋玉鵬;海洋平臺樁基沖刷及影響因素分析[J];海岸工程;2004年04期

6 董斌;邊淑華;劉建強;金永德;胡澤建;;往復海流作用下樁基局部沖刷及海底沉積物粒度變化[J];海岸工程;2009年02期

7 孫永福;宋玉鵬;孫惠鳳;馬江;;潮流作用下海洋平臺樁基沖刷過程及沖刷深度計算[J];海洋科學進展;2007年02期

8 邊淑華;胡澤建;胡光海;仲德林;劉建立;;淤泥質粉砂海底典型平臺樁基沖刷[J];海洋測繪;2006年02期

9 尹德操;尤云祥;魏崗;;均勻流中直立圓柱體繞流三維數(shù)值模擬[J];海洋工程;2007年04期

10 韋雁機;葉銀燦;吳珂;來向華;;樁周局部沖刷三維數(shù)值模擬[J];海洋工程;2009年04期

本文編號：2185433