本文選題：深水畸形波 + 波流干擾��； 參考：《上海交通大學》2014年碩士論文

【摘要】：畸形波因為其破壞性強、出現(xiàn)沒有前兆等特點，對于船舶海洋工程有重大的工程研究意義；同時，雖然已經(jīng)有幾種理論可以解釋畸形波的產(chǎn)生，其機理仍不明確，具有一定的理論研究價值。另外，實海中，波流相互干擾是不可忽視的因素，流的存在會對波浪的參數(shù)、傳播和形狀產(chǎn)生重要的影響，逆流也被認為是畸形波的重要成因之一，故流對畸形波的影響也是不可忽視的。本文基于粘性模型，著眼于色散關(guān)系引起的波浪聚焦而產(chǎn)生的畸形波，探討畸形波生成原理和演化過程，數(shù)值模擬畸形波的生成和演化以及討論波流干擾對畸形波的影響是本文的兩個主要部分。 本文的主要研究內(nèi)容包括：1）基于RANS方程和RNG k-ε湍流模型，并用VOF方法處理自由表面，生成流作用下的規(guī)則波。2）進行規(guī)則波的循環(huán)水槽實驗，驗證規(guī)則波的生成以及它和均勻順流的相互作用，建立了可靠的數(shù)值水槽。3）討論順流和逆流對于規(guī)則波影響，除了對波浪要素的變化進行了定量討論，對逆流中出現(xiàn)的波陡升高、波浪不對稱性加劇、波浪破碎和波浪堵塞現(xiàn)象進行了詳細研究。4）基于建立的數(shù)值水槽，運用過渡水波理論生成畸形波，研究了順流和逆流對于畸形波的影響，并和基于四階非線性薛定諤（NLS）方程的模擬結(jié)果進行比較，討論了粘性流下畸形波的機理。 主要結(jié)論有：1）流對于波浪要素的影響和既往研究結(jié)論一致，即：順流中波高和波陡會變小，，逆流會增加波浪的波高和波陡。2）粘性模型在預(yù)測波高的變化時準確性更好。3）逆流會使得波浪波峰變尖，不對稱性加劇，時有波浪破碎發(fā)生。4）當逆流速度接近波群速時，會出現(xiàn)波浪堵塞現(xiàn)象，波流之間出現(xiàn)強烈的能量轉(zhuǎn)換。5）粘性模型預(yù)測的畸形波聚焦時間和勢流理論相比要晚，在實驗中應(yīng)該充分考慮這一因素。6）流的存在會加劇畸形波的不對稱性，且粘性模型和勢流理論預(yù)測的變化規(guī)律存在差異。7）順流中畸形波聚焦更快，逆流中聚焦更慢。8）逆流會加劇畸形波的破碎現(xiàn)象。
[Abstract]:Because of its destructive and no precursor characteristics, the deformable wave has great engineering significance for marine engineering. At the same time, although there are several theories to explain the formation of the deformed wave, its mechanism is still unclear. It has certain theoretical research value. In addition, in the real sea, the interaction of waves and currents is an important factor that can not be ignored. The existence of currents will have an important impact on the parameters, propagation and shape of waves, and countercurrent is also considered to be one of the important causes of abnormal waves. Therefore, the effect of the current on the abnormal wave can not be ignored. In this paper, based on the viscous model, the formation principle and evolution process of the wave focusing caused by dispersion relation are discussed. Numerical simulation of the generation and evolution of deformable waves and discussion of the effects of wave and current interference on deformities are two main parts of this paper. The main research contents of this paper include: (1) based on RANS equation and RNG k- 蔚 turbulence model, the regular wave of regular wave is generated by using VOF method to treat free surface. To verify the generation of regular wave and its interaction with uniform forward current, a reliable numerical tank. 3) to discuss the influence of forward current and countercurrent on regular wave, except for the change of wave elements, is discussed quantitatively. In this paper, the phenomena of wave rise, wave asymmetry, wave breakage and wave blockage in countercurrent are studied in detail. Based on the established numerical flume, the transient water wave theory is used to generate deformed waves. The effects of downstream and countercurrent on the deformable waves are studied and compared with the simulation results based on the fourth-order nonlinear Schrodinger (NLS) equation. The mechanism of the deformities under viscous flow is discussed. The main conclusion is that the effect of the current on the wave elements is consistent with previous studies, that is, the wave height and steepness in the downstream flow will become smaller. The inverse current will increase the wave height and wave steep.2.) the viscosity model is more accurate in predicting the variation of wave height. 3) the countercurrent will make the wave peak sharpen, asymmetry intensifies, and wave fragmentation occurs. 4) when the countercurrent velocity approaches the wave group velocity, The phenomenon of wave blockage will occur, and there will be a strong energy conversion between waves and currents. 5) the focusing time of deformed waves predicted by viscous model is later than that of potential flow theory. In the experiment, the existence of this factor. 6) flow will aggravate the asymmetry of the deformed wave, and there is a difference between the viscosity model and the potential flow theory. 7) in the downstream flow, the deformity wave focuses more quickly. In the countercurrent, the focusing is slower. 8) the countercurrent will aggravate the fragmentation of the deformed waves.
【學位授予單位】：上海交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P731.22

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