本文關鍵詞： 數(shù)值浪槽 流體體積法 海上風機 風浪聯(lián)合作用　出處：《哈爾濱工業(yè)大學》2014年碩士論文　論文類型：學位論文

【摘要】：海洋中存在風能、波浪能等多種可再生資源。數(shù)值浪槽是評估人工俘能裝置在惡劣海洋環(huán)境下安全性的重要工具。其中結合有限體積法(FVM)與流體體積法(VOF)的數(shù)值浪槽,通過對納維-斯托克斯方程的直接求解,可以考慮流體的粘性,并有能力模擬波浪破碎以及風浪相互作用等復雜過程。本文采用了這一數(shù)值離散方案,結合勢流理論完成了數(shù)值造波,通過建立的數(shù)值浪槽研究了波浪的運動規(guī)律,并通過與海上風機計算程序的連接,把數(shù)值浪槽生成的完全非線性波浪應用于海上風機的波浪力計算中。 本文首先進行了數(shù)值浪槽的建立,以及對于規(guī)則波的模擬與驗證。將勢流理論得到的解析結果作為數(shù)值造波的理論依據(jù),分別使用速度入口法和運動物體法兩種方式造波,使用人工阻尼區(qū)進行遠端消波。在有限長度的二維數(shù)值浪槽中進行了規(guī)則波的模擬與驗證。使用數(shù)值浪槽的結果分析了規(guī)則波的水平速度沿豎向截面分布規(guī)律,驗證了Wheeler展開理論對于波峰所在豎向截面的速度修正方法。 隨后使用運動物體法對數(shù)值浪槽進一步發(fā)展,完成了不規(guī)則波的模擬與驗證。模擬了由于不規(guī)則波的不同頻率成分在波浪表面局部區(qū)域聚焦而產(chǎn)生水粒子速度過大從而發(fā)生波浪破碎的過程。 對于自然界中存在的風浪聯(lián)合環(huán)境,本文進行了穩(wěn)定風與規(guī)則波下風浪相互作用的初步探討,發(fā)現(xiàn)了穩(wěn)定風會降低規(guī)則波波幅的現(xiàn)象,并從波浪表面壓力不均勻分布的角度對波高降低現(xiàn)象進行了定量分析。 最后,作為數(shù)值浪槽與工程應用相結合的示例,本文將數(shù)值浪槽得到的完全非線性不規(guī)則波浪應用于固定單樁式近海風機的波浪力計算中,發(fā)現(xiàn)傳統(tǒng)的波浪模型可能會低估波浪荷載。
[Abstract]:Wind energy exists in the ocean. Wave energy and other renewable resources. Numerical wave grooves are important tools for evaluating the safety of artificial energy capture devices in harsh marine environments. The finite volume method (FVM) is combined with the fluid volume method (VOF). Of the numerical grooves. Through the direct solution of the Navier-Stokes equation, the viscosity of the fluid can be considered and the complex processes such as wave breaking and wind wave interaction can be simulated. This numerical discrete scheme is used in this paper. Combined with the potential flow theory, the numerical wave generation is completed, and the motion law of the wave is studied through the established numerical wave trough, which is connected with the calculation program of the offshore fan. The completely nonlinear wave generated by numerical wave grooves is applied to the wave force calculation of offshore fan. In this paper, the numerical wave trough is established, and the simulation and verification of the regular wave are carried out. The analytical results obtained from the potential flow theory are taken as the theoretical basis for the numerical wave generation. The velocity inlet method and the moving object method are used to generate waves respectively. Artificial damping region is used for far-end wave elimination. The regular wave is simulated and verified in a 2-D numerical wave trough with finite length. The horizontal velocity distribution of regular wave along vertical section is analyzed using the results of numerical wave slot. The velocity correction method for vertical cross section of wave peak is verified by Wheeler expansion theory. Then the moving object method is used to further develop the numerical wave trough. The simulation and verification of irregular wave are completed, and the process of wave breaking is simulated because the different frequency components of irregular wave focus in the local region of the wave surface and the velocity of water particle is too large. In this paper, the interaction between steady wind and regular wave is discussed, and the phenomenon that steady wind decreases the amplitude of regular wave is found. The phenomenon of wave height decreasing is analyzed quantitatively from the angle of uneven distribution of wave surface pressure. Finally, as an example of the combination of numerical wave trough and engineering application, the completely nonlinear irregular wave obtained by numerical wave trough is applied to the wave force calculation of fixed single pile offshore fan. It is found that traditional wave models may underestimate wave loads.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV139.2

【參考文獻】

相關期刊論文 前1條

1 孫大鵬,李玉成;非線性波浪變形計算的三維邊界元方法[J];水科學進展;2002年04期

，

本文編號：1491978