發(fā)布時間：2018-04-03 10:45

  本文選題：孤立波　切入點：排柱　出處：《長沙理工大學》2015年碩士論文

【摘要】：排柱式建筑物在近海工程中的應用越來越廣泛,而對于其在極端波況條件下附近水動力特性的研究目前仍較少,且主要以物理實驗模型為主,未能完全獲得模型附近的水動力特性信息。本文利用OpenFOAM開源程序包作為數(shù)值模擬工具,基于不可壓縮Navier-Stokes方程,利用修正體積分數(shù)法捕捉自由液面,并耦合分離渦紊流方法中的Spalart-Allmaras DDES模型,建立孤立波與排柱間相互作用的三維水動力數(shù)學模型。通過開展相應的物理模型實驗,獲得排柱模型附近準確和完整的水動力特性信息,并以此對數(shù)學模型的可靠性進行驗證。之后本文對非破碎孤立波作用下排柱和單柱、不同間隙比條件下排柱和破碎孤立波作用下不同排柱模型位置等條件下模型附近的水動力特性進行數(shù)值模擬研究,對比分析各工況條件下自由液面、水流結構、動水壓強和波浪力等水動力特性的變化規(guī)律,探討模型附近的能量耗散機理和受力特性,為今后單排圓柱式建筑物在近海工程的實際應用提供一定的理論參考。通過對比實驗和數(shù)值計算結果,發(fā)現(xiàn)數(shù)值模型可以準確模擬孤立波與排柱相互作用過程中水動力特性的變化,能夠精確捕捉到模型附近自由液面復雜的三維特征、間隙內高速水流的分離現(xiàn)象和柱后大尺度的尾渦結構。排柱附近的水動力特性變化規(guī)律相比單柱模型更為復雜,自由液面三維特征顯著,間隙內排柱表面出現(xiàn)較強的水流分離現(xiàn)象,尾渦尺度和紊動強度均大于單柱。間隙比的不同直接影響到間隙內水體的流速大小,導致柱后水流的紊動特性出現(xiàn)不同,能量耗散差異明顯,從自由液面上表現(xiàn)為排柱模型不同的消波性能。破碎點位置附近孤立波作用下排柱附近的水動力變化的復雜程度和能量耗散機理與非破碎波下相比明顯不同,作用過程中耦合了建筑物的阻水作用和波浪的淺水波變形特征,水動力特性變化具有明顯的涌波作用特征。
[Abstract]:Row type building application in offshore engineering more and more widely, and in the dynamic characteristics of water near the extreme wave condition is still less, and the physical experimental model, not completely get information hydrodynamic characteristics near the model. This paper uses the OpenFOAM open source package as a numerical simulation tool, can not compression based on Navier-Stokes equation, the modified volume fraction method to capture the free surface, and the Spalart-Allmaras DDES model of turbulent vortex separation coupling method, a three-dimensional hydrodynamic model of interaction between solitary wave and row. By carrying out the corresponding physical model experiment, obtain the row model near the accurate and complete information and the dynamic characteristics of water. The reliability of the mathematical model is verified. After the non broken columns and single column solitary wave under the conditions of different clearance ratio Columns and numerical simulation of the hydrodynamic characteristics of broken model near the solitary wave under the action of different row position under the condition of model, comparative analysis of the flow structure of free surface, under different working conditions. The variation of hydrodynamic characteristics of hydrodynamic pressure and wave force, to investigate the energy dissipation mechanism model nearby and force characteristics for single row cylindrical buildings provide a theoretical reference for practical application in offshore engineering. By comparing the experimental and numerical results, the numerical model can accurately simulate the changes of solitary waves and the interaction process of dynamic characteristics of water columns, can accurately capture the 3D model feature near the free surface complex, large scale vortex structure the gap in high-speed flow separation and post column row. Near the water dynamic characteristics compared with the single column model is more complex, the free surface three Dimensional characteristics and columns appear on the surface of strong flow separation gap, tail vortex and turbulence intensity were higher than single column. The flow velocity in the different water gap to directly affect the ratio of the gap, leading to turbulence characteristics of different column, the energy dissipation difference is obvious, from the performance of the free surface is row model of wave dissipation performance. Different crushing complexity of the point position near the isolated hydrodynamic changes near the wave row and the energy dissipation mechanism and non breaking wave under markedly different role in the process of building the coupling shallow water blocking effect and wave deformation characteristics, changes of hydrodynamic characteristics with wave function obvious characteristics.

【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TV131.2

【參考文獻】

相關期刊論文 前6條

1 傅朝方;朱大同;;梳狀防波堤上波浪反射[J];海洋工程;2013年04期

2 傅朝方;朱大同;;透空管防波堤上的波浪力[J];海岸工程;2013年01期

3 周恒;張涵信;;號稱經典物理留下的世紀難題“湍流問題”的實質是什么?[J];中國科學:物理學 力學 天文學;2012年01期

4 朱大同;傅朝方;;樁列透空堤的水動力計算[J];海岸工程;2011年02期

5 朱大同;傅朝方;;波浪與透空管防波堤的相互作用[J];水動力學研究與進展A輯;2010年05期

6 陳子q，

本文編號：1704855