水流作用下菱形金属网片水动力学特性的研究

发布时间：2018-04-10 19:23

本文选题：菱形金属编织网片 + 流固耦合　；参考：《大连海洋大学》2017年硕士论文

【摘要】：本文通过ABAQUS软件,建立了菱形金属网片在水流作用下的受力运动方程模型。对不同材质、网目形状、网目大小以及不同网线直径的菱形金属网片的水阻力大小进行了数值分析,通过和试验结果比较可知,采用基于ABAQUS建立的金属网片受力运动模型具有较好地准确性。目前国内外网箱水阻力特性研究几乎都集中在以纤维类网衣的网箱结构型式上,而金属类网衣在波流作用下的水阻力特性方面的报道相对较少。与纤维类网衣相比,金属类网衣质量、刚度、表面粗糙度等方面有较大变化,与此对应的水动力特性也将发生变化,对整个金属类网箱系统而言,在波流作用下的水阻力特性与普通纤维类网箱将有较大区别,与之对应的研究方法少之又少,尤其是数值模拟,国内尚未对尺寸完整的金属网衣做过这方面的研究。因此研究在波流等动力因素作用下网衣系统的水动力特性具有重要的现实意义。本论文成功模拟了整体金属网片在均匀来流时的水动力特性,并通过与物理模型所取得的数据做对比来验证本数学模型的可靠性和优越性。具体研究内容简述如下:第一部分主要介绍论文研究背景、国内外深水网箱发展概况及研究进展。第二部分简要介绍网片物理模型试验设计情况。论文考虑试验条件及网衣相似设计的特殊要求,并根据目前网箱养殖工程实际情况采用金属原型网衣进行,并考虑了金属网衣的两种材质、三种网目形状、和三种网线直径。第三部分介绍介绍数值计算方法的原理及其控制方程,论文所采用的控制方程是根据质量守恒所得到的连续性方程以及动量方程。第四部分详细介绍了数值模拟的结果以及与试验值之间的对比情况。数学模拟所得到的数据与试验值得到的数据之间差异较小,图形曲线光滑,拟合程度较高,表明采用基于ABAQUS方法进行方形金属网片水动力特性研究是可行的。文章最后对本文取得的主要研究成果进行了总结,同时对方形金属网片水阻力研究发展进行了展望。进入21世纪,网箱养殖设施工程装备日趋向深海区域、大型化发展,进行金属网衣网箱在我国的改良测试及试点应用推广研究,不仅是一项有不断创新的空间、可以规避养殖渔业潜在不利因素的面向未来的技术,而且是一项发展历史与传承的养殖技术。金属网衣乃至网箱的水动力特性研究对于大力发展基于环境保护和生态系统的高效海洋养殖、长期提高中国海洋渔业的产能有着意义非凡的实践价值。
[Abstract]:The water resistance of diamond metal mesh with different material, mesh shape, mesh size and different mesh diameter is numerically analyzed, and the results are compared with the experimental results.The model of metal mesh motion based on ABAQUS has good accuracy.At present, almost all the researches on the water resistance characteristics of netting at home and abroad are focused on the cages with fiber netting, but there are few reports on the water resistance characteristics of metal netting under the action of wave and current.Compared with fibrous netting, the mass, stiffness and surface roughness of metal netting have great changes, and the corresponding hydrodynamic characteristics will also change, for the whole metal netting system,The characteristics of water resistance under the action of wave and current will be quite different from those of ordinary fiber cages, and the corresponding research methods are very few, especially the numerical simulation, which has not been done on the metal netting with complete size in our country.Therefore, it is of great practical significance to study the hydrodynamic characteristics of the netting system under the action of wave and current and other dynamic factors.This paper successfully simulates the hydrodynamic characteristics of the whole metal mesh sheet under uniform flow, and verifies the reliability and superiority of the mathematical model by comparing it with the data obtained from the physical model.The main contents are as follows: the first part mainly introduces the research background, the development and progress of deep-water cages at home and abroad.The second part briefly introduces the physical model design of the mesh.Considering the test conditions and the special requirements of the similar design of the netting, and according to the actual situation of the cage culture project, the paper adopts the metal prototype netting, and takes into account two kinds of materials, three mesh shapes and three mesh diameters of the metal netting.In the third part, the principle and control equation of numerical calculation are introduced. The control equations are obtained according to the conservation of mass and the momentum equation.In the fourth part, the results of numerical simulation and the comparison with experimental data are introduced in detail.The difference between the data obtained by mathematical simulation and the data worth testing is small, the curve is smooth and the fitting degree is high, which indicates that it is feasible to study the hydrodynamic characteristics of square metal mesh sheet based on ABAQUS method.At the end of this paper, the main research results are summarized, and the development of the research on the water resistance of square metal mesh is prospected.In the 21st century, the equipment day of cage breeding facilities tends to the deep sea area and develops on a large scale. It is not only a space of continuous innovation to carry out the improvement test and pilot application research of metal netting cage in our country.It is a future-oriented technology which can avoid the potential disadvantages of aquaculture fishery, and it is also a historical and inherited breeding technology.The study on hydrodynamic characteristics of metal netting and cages is of great practical value for the development of efficient marine aquaculture based on environmental protection and ecosystem and the long-term improvement of marine fishery productivity in China.
【学位授予单位】：大连海洋大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S971.4

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