海洋环境要素运动分析与可视化方法研究

发布时间：2019-05-29 16:52

【摘要】：海洋拥有巨大的政治、经济和军事价值,历来为各国所重视。随着我国海洋利益的不断拓展,如何有效保护海洋权益,是当前重大而急迫的问题。然而,由于海洋的极端复杂性,给人们认识、理解与利用海洋带来了极大挑战。海洋环境要素作为海洋环境的重要组成部分,其运动深刻影响着海上作业、航行保障、海洋预警等多项任务。如何理解海洋环境要素的运动规律,以及如何有效观察海洋的运动特性,已成为研究与认识海洋的瓶颈问题。因此研究海洋环境要素的运动与可视化方法具有重要的现实意义。本文从海洋环境要素运动规律的分析计算、运动特性的观察显示两个方面展开研究,分别提出了海洋环境要素运动分析与快速计算、流固耦合计算、基于视觉舒适度的立体显示等方法,构建了可视化实验系统。论文的主要工作如下:(1)针对海洋环境要素自身运动分析与计算中,经典SPH方法速度较慢、效率较低的问题,提出了一种基于右邻域胞元粒子搜索的海洋环境要素运动分析与快速计算方法。首先基于经典方法选取了控制方程的核函数,然后基于右邻域胞元实现了粒子的快速搜索,最后对数值处理过程的人工压缩率、边界处理、时间积分等关键问题进行了优化。实验表明,在粒子数较大时,该方法显著提高了SPH的计算效率。(2)针对海洋环境要素与其中物体的相互作用中,流体与固体的耦合计算问题,提出了一种基于RNC的海洋环境要素流固耦合计算方法。首先分析了流固耦合问题的经典研究方法,然后对RNC方法的初始设置、流体与固体的受力分析、碰撞检测、迭代流程等进行了计算与分析。最后设计了溃坝模拟和流体与木块耦合运动的模拟实验,结果表明,该方法能够有效实现流固耦合问题计算。(3)针对复杂海洋环境要素的可视化问题中,大规模粒子运动观察的直观性与显示效果较差问题,提出了一种基于视觉舒适度的海洋环境要素立体显示方法,首先建立了立体显示的投影模型,然后基于深度匹配实现了视觉舒适度计算,在此基础上,建立了与大规模粒子运动观察相适应的立体观察模型。实验结果表明,该方法可以有效计算最佳的立体观察位置,粒子观察效果清晰、有效。(4)设计并实现了面向海洋环境要素运动分析的可视化实验系统,从系统的对象建模、体系结构、功能框架、运行流程等进行了设计,实现了系统主界面、以及数值分析与可视化子系统。
[Abstract]:The ocean has great political, economic and military value, and has always been attached importance to by all countries. With the continuous expansion of marine interests in China, how to effectively protect marine rights and interests is an important and urgent problem at present. However, due to the extreme complexity of the ocean, it brings great challenges to people's understanding, understanding and utilization of the ocean. As an important part of the marine environment, the movement of marine environment elements has a profound impact on many tasks, such as marine operation, navigation support, marine early warning and so on. How to understand the movement law of marine environmental elements and how to effectively observe the motion characteristics of the ocean have become the bottleneck problems in the study and understanding of the ocean. Therefore, it is of great practical significance to study the movement and visualization of marine environmental elements. In this paper, the analysis and calculation of the motion law of marine environmental elements and the observation and display of motion characteristics are studied, and the motion analysis and rapid calculation and fluid-solid coupling calculation of marine environmental elements are put forward respectively. Based on the stereoscopic display of visual comfort, a visual experimental system is constructed. The main work of this paper is as follows: (1) in the analysis and calculation of the motion of marine environment elements, the classical SPH method is slow and inefficient. A fast method for motion analysis and calculation of marine environmental elements based on right neighborhood cellular particle search is proposed. Firstly, the kernel function of the governing equation is selected based on the classical method, and then the fast particle search is realized based on the right neighborhood cell. Finally, the key problems such as artificial compression ratio, boundary processing and time integral in the numerical processing process are optimized. The experimental results show that when the number of particles is large, this method can significantly improve the computational efficiency of SPH. (2) aiming at the coupling calculation of fluid and solid in the interaction between marine environmental elements and objects in it, A fluid-solid coupling calculation method of marine environmental elements based on RNC is proposed. Firstly, the classical research methods of fluid-solid coupling problem are analyzed, and then the initial setting of RNC method, force analysis of fluid and solid, collision detection, iterative process and so on are calculated and analyzed. Finally, the dam break simulation and the simulation experiment of the coupling motion between fluid and wood block are designed. The results show that the method can effectively realize the calculation of fluid-solid coupling problem. (3) in the visualization of complex marine environmental elements, The visualization and display effect of large-scale particle motion observation are poor. A stereoscopic display method of marine environmental elements based on visual comfort is proposed. Firstly, the projection model of stereoscopic display is established. Then the visual comfort calculation is realized based on depth matching. On this basis, a stereoscopic observation model suitable for large-scale particle motion observation is established. The experimental results show that the method can effectively calculate the best stereoscopic observation position, and the particle observation effect is clear and effective. (4) A visual experimental system for the motion analysis of marine environmental elements is designed and implemented, and the object modeling of the system is carried out. The architecture, functional framework, running flow and so on are designed, and the main interface of the system, as well as the numerical analysis and visualization subsystem are realized.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P73;P714

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