基于质量源方法的斜坡堤越浪数值研究

发布时间：2018-03-19 13:47

本文选题：斜坡堤　切入点：越浪　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：斜坡堤是近海沿海地区抵御海浪灾害的有效屏障,是人工掩护的沿海港口的重要组成部分。越浪量是斜坡堤设计的一个重要参数,这个参数主要被用于确定斜坡堤的堤顶高程。综合考虑结构的安全性和经济成本,预测斜坡堤在各种情况下的越浪量和制定其允许越浪量标准就显得格外的重要。本文利用FLUENT软件,基于粘性不可压缩流体的雷诺时均N-S方程和κ-ε湍流模型,采用有限体积法对控制方程进行离散,建立数学模型。基于质量源造波、动量源消波的方法,采用VOF方法捕捉自由表面,开发了无反射造波的二维数值波浪水槽,在不增加水槽长度的前提下实现了造波的长历史性。通过分别模拟规则波和不规则波,并且与理论值对比,验证了该数值波浪水槽的精确性。利用所建立的数值波浪水槽模拟规则波作用下斜坡堤的越浪,其中包括无胸墙斜坡堤和有胸墙斜坡堤。通过分解其中一个周期的过程矢量图,分析波浪在越浪过程中的运动特性。模拟了文献中部分工况,并将数模计算越浪量与物模试验结果对比,二者吻合良好,趋势一致,验证了该模型在处理斜坡堤越浪问题方面的有效性和精确性,具有一定工程适用性。接着进行不规则波在斜坡堤上越浪量的研究,通过建立模型,分别讨论了相对顶高、斜坡坡比和相对水深等因素与平均越浪量的关系,将数值计算结果与文献结果对比,二者吻合良好,趋势一致。
[Abstract]:Slope embankment is an effective barrier to resist wave disaster in coastal areas near the sea and an important part of the artificially sheltered coastal port. The amount of overrunning waves is an important parameter in the design of slope levees. This parameter is mainly used to determine the top elevation of the slope embankment. Considering the safety and economic cost of the structure, it is very important to predict the overtopping quantity of the slope embankment under various conditions and to formulate its allowable surcharge standard. In this paper, based on Reynolds time averaged N-S equation and 魏-蔚 turbulence model of viscous incompressible fluid, the control equation is discretized by finite volume method, and the mathematical model is established by using FLUENT software. The VOF method is used to capture the free surface, and a two-dimensional numerical wave flume is developed without increasing the length of the flume. By simulating the regular wave and the irregular wave respectively, and comparing with the theoretical values, The accuracy of the numerical wave flume is verified. The established numerical wave flume is used to simulate the surpassing of the slope embankment under the action of regular waves, including the slope embankment without chest wall and the slope embankment with chest wall. The characteristics of wave motion in the process of surpassing waves are analyzed. Some working conditions in the literature are simulated, and the numerical simulation results are compared with the results of the physical model test. The results are in good agreement with each other and the trend is consistent. The validity and accuracy of the model in dealing with the problem of slope breakwater surpassing are verified, and the model has certain engineering applicability. Then, the relationship between the relative top height, slope ratio and relative water depth and the average surpassing wave volume is discussed, and the numerical results are compared with the results of the literature, by establishing the model of the irregular wave surpassing quantity on the slope embankment, and by establishing the model, the relationship between the relative top height, slope ratio and relative water depth is discussed respectively. The two are in good agreement and the trend is consistent.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U656.21

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