海洋平台桩基结构物的流固耦合模拟研究

发布时间：2018-04-29 02:14

本文选题：海洋支撑平台 + 桩柱结构　；参考：《华北电力大学》2014年硕士论文

【摘要】：在海洋波浪环境下,近海及海洋工程建筑物常年受到风、波浪、海流的作用,其中波浪荷载是最主要的控制荷载。在港口工程及近海工程中,桩柱和桩群结构是普遍采用的结构形式,而桩柱结构在波浪场中所受的波浪、流体载荷及其对波浪场的影响日益成为流体力学中的一个重要问题。因此,对桩柱结构和波浪场之间的双向流固耦合模拟分析有着十分重要的研究意义。本文简要介绍了我国海洋能的发展,概括了波浪和海洋结构物相互作用的计算方法,总结了波浪数值模拟的研究进展及流固耦合研究进展。论述了流固耦合分析时的控制方程、湍流模型等基本原理,系统的概述了线性波特性、控制方程以及边界条件。简要的介绍了数值造波的方法及运用VOF法实现水气自由液面的设置方法。应用ANSYS-Workbench和CFX软件建立了三维数值波浪水槽,通过设定边界条件,实现了三维数值造波,并对数值模型进行了验证。其次应用ANSYS和CFX对单桩柱和波浪场进行了双、单向流固耦合模拟计算,并分析了两种模拟方法桩柱所受的最大等效应力和流场的变化情况,评价桩柱的稳定性。最后应用ANSYS和CFX软件对串列双桩柱和波浪场进行了双向流固耦合模拟,结合单桩柱的模拟结果,对单、双桩柱上的最大等效应力进行了对比。结果表明：在给定的波浪条件下,桩柱所受的最大应力发生在桩柱底部,其应力值在15704Pa-16320Pa之间呈周期性的变化,根据Von Mises屈服准则,说明桩柱在这种波浪条件下是稳定的；双向流固耦合比单向流固耦合更能近似的模拟真实状态；对单、双桩柱上的最大等效应力进行了对比,串列双桩柱的最大Von Mises应力较单桩柱的最大Von Mises应力偏小。本文对单桩柱和双桩柱的流固耦合研究方法有一定的参考价值。
[Abstract]:In the ocean wave environment, offshore and marine engineering buildings are subjected to wind, waves and currents all year round, among which wave load is the most important control load. In port engineering and offshore engineering, pile-column and pile-group structures are generally used as structural forms. The wave, fluid load and its influence on wave field of pile-column structure in wave field are increasingly becoming an important problem in hydrodynamics. Therefore, it is of great significance to study the bidirectional fluid-solid coupling analysis between the pile-column structure and the wave field. This paper briefly introduces the development of ocean energy in China, summarizes the calculation methods of the interaction between waves and ocean structures, summarizes the research progress of numerical simulation of waves and the research progress of fluid-solid coupling. The control equation and turbulence model in fluid-solid coupling analysis are discussed. The linear wave characteristics, control equations and boundary conditions are systematically summarized. This paper briefly introduces the method of numerical wave generation and the method of setting the free surface of water and gas by using VOF method. Three-dimensional numerical wave flume was established by using ANSYS-Workbench and CFX software. The three-dimensional numerical wave generation was realized by setting boundary conditions, and the numerical model was verified. Secondly, ANSYS and CFX are used to simulate the double and unidirectional fluid-structure coupling of single pile column and wave field. The maximum equivalent stress and flow field of the two simulation methods are analyzed, and the stability of pile column is evaluated. In the end, ANSYS and CFX software are used to simulate the two-direction fluid-structure coupling between the two piles and the wave field. The maximum equivalent stress on the single and double piles is compared with the simulation results of the single pile column. The results show that under the given wave conditions, the maximum stress of the pile column occurs at the bottom of the pile column, and its stress value varies periodically between the 15704Pa-16320Pa values. According to the Von Mises yield criterion, the pile column is stable under the wave condition. Two-way fluid-solid coupling is more approximate than unidirectional fluid-solid coupling to simulate the real state, and the maximum equivalent stress on single and double piles is compared. The maximum Von Mises stress of tandem double-pile column is smaller than that of single pile column. This paper has some reference value for the research method of fluid-solid coupling between single pile column and double pile column.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P751

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