【摘要】：開孔沉箱作為一種新型港口和海岸防護結(jié)構(gòu)物自上世紀中葉被提出以來,因其具有消浪效果好且工程成本低等優(yōu)點,已得到廣泛的科學(xué)研究和工程應(yīng)用。就目前的研究成果來看,對于波浪與開孔沉箱相互作用的物模試驗成果較為豐富,但是數(shù)值模擬研究特別是波浪與雙層開孔沉箱相互作用的數(shù)值模擬成果相對較少且數(shù)值方法較為單一,其中時域內(nèi)準確地完成對自由水面的追蹤,是建立波浪與開孔沉箱相互作用數(shù)值模式過程中的難點問題之一。CLEAR-VOF方法的問世對于解決該問題提供了新的思路,這是本文進行數(shù)值計算依賴的關(guān)鍵手段。 本文首先利用三步有限元方法離散Navier-Stokes方程,并借助CLEAR-VOF方法、大渦模擬方法追蹤水體自由表面和模擬湍流效應(yīng),建立了二維數(shù)值波浪水槽,成功模擬了規(guī)則波的傳播。籍此研究了規(guī)則波作用下單層開孔沉箱的反射率和波浪總水平力,并與其他學(xué)者的物模試驗結(jié)果和數(shù)模結(jié)果進行了對比,吻合良好且規(guī)律性明顯,為波浪與開孔沉箱相互作用問題的研究探索了一種新的數(shù)值模式。 在此基礎(chǔ)上,本文進行了波浪與雙層開孔沉箱相互作用的數(shù)值試驗,分析了反射率和波峰總水平力比等指標,并與其他學(xué)者的物模試驗結(jié)果進行對比,吻合良好,進一步驗證了本文數(shù)值模式的可靠性。分析了總消浪室相對寬度、后消浪室相對寬度、波陡、相對水深和前開孔墻開孔率等無量綱量對波谷總水平力比的影響關(guān)系并成功擬合經(jīng)驗關(guān)系式,指出雙層開孔沉箱波谷總水平力比主要受總消浪室相對寬度和相對水深的影響且大致呈現(xiàn)線性遞減關(guān)系。 最后以某工程為例,進行了實際尺度單層和雙層開孔沉箱結(jié)構(gòu)物的驗證分析,表明本文所建數(shù)值模式在開孔沉箱工程設(shè)計和研究領(lǐng)域的適用性。
[Abstract]:As a new type of port and coastal protection structure, caisson has been widely studied and applied in engineering because of its good wave attenuation effect and low engineering cost since it was put forward in the middle of last century. According to the current research results, the results of the physical model tests on the interaction between waves and open-hole caisson are relatively rich. But the numerical simulation, especially the numerical simulation of the interaction between waves and double-layer caisson, is relatively few and the numerical method is relatively simple, in which the tracking of free water surface is completed accurately in time domain. It is one of the difficult problems in the process of establishing a numerical model of wave-open caisson interaction. The advent of CLEAR-VOF method provides a new way to solve this problem, which is the key means of numerical calculation in this paper. In this paper, the three-step finite element method is first used to discretize the Navier-Stokes equation. With the help of CLEAR-VOF method, the large eddy simulation method is used to track the free surface of the water body and to simulate the turbulent effect. The two-dimensional numerical wave flume is established and the regular wave propagation is successfully simulated. In this paper, the reflectivity and the total wave horizontal force of a single-layer open-hole caisson under the action of regular waves are studied, and the results are compared with those obtained by other scholars, and the results are in good agreement with those of the numerical models. A new numerical model is proposed for the study of the interaction between waves and open caisson. On this basis, the numerical experiments on the interaction between waves and double-layer caisson are carried out, and the reflectivity and the ratio of wave peak to total horizontal force are analyzed. The results are in good agreement with those obtained by other scholars. The reliability of the numerical model is further verified. The effects of dimensionless measures such as the relative width of the total wave suppression chamber, the relative width of the rear wave suppression chamber, the steep wave, the relative water depth and the opening ratio of the front hole wall on the total horizontal force ratio of the trough are analyzed and the empirical relations are fitted successfully. It is pointed out that the total horizontal force ratio of the double deck caisson is mainly affected by the relative width and the relative water depth of the total wave dissipating chamber and shows a linear decreasing relation. Finally, taking a project as an example, the verification and analysis of single-layer and double-layer open-hole caisson structures are carried out on a practical scale, which shows the applicability of the numerical model established in this paper in the field of engineering design and research of open-hole caissons.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U656.3;U652.3

【參考文獻】

相關(guān)期刊論文 前10條

1 陳雪峰,李玉成,滕斌;開孔沉箱總水平力若干計算方法的比較[J];港工技術(shù);2005年02期

2 朱大同;;雙層開孔板沉箱防波堤的水動力學(xué)特征的非線性分析[J];船舶力學(xué);2013年Z1期

3 滕斌,李玉成,劉洪杰;開孔沉箱與斜向波作用的理論研究和實驗驗證[J];海洋工程;2004年01期

4 李玉成,劉洪杰,滕斌;雙層局部開孔板沉箱對波浪反射的理論研究[J];海洋工程;2005年01期

5 吳浩;孫大鵬;夏志盛;;波浪與大開孔消浪結(jié)構(gòu)作用非線性數(shù)值模擬[J];海洋工程;2010年03期

6 萬慶宇;路偉;夏志盛;;低基床規(guī)則波作用下開孔沉箱反射系數(shù)的試驗研究[J];科協(xié)論壇(下半月);2010年05期

7 路偉;萬慶宇;夏志盛;;中基床上規(guī)則波作用下開孔沉箱反射系數(shù)的試驗研究[J];科協(xié)論壇(下半月);2010年05期

8 成小飛;王永學(xué);王國玉;任冰;;海底子母管線在規(guī)則波作用下的數(shù)值研究[J];水道港口;2012年03期

9 王永學(xué);無反射造波數(shù)值波浪水槽[J];水動力學(xué)研究與進展(A輯);1994年02期

10 孫大鵬,李玉成;三維數(shù)值波動水槽波浪變形計算的0—1混合型邊界元方法[J];水動力學(xué)研究與進展(A輯);1999年04期

相關(guān)博士學(xué)位論文 前1條

1 孫英偉;直立堤前的破碎波流場特征及波浪力研究[D];大連理工大學(xué);2012年

，

本文編號：2361713