| The ocean has always been taken seriously by every country because of its huge political,economic and military value.As the extension and development of the ocean,China's maritime interests continue to expand,maritime activities are becoming more and more frequent,the protect of the rights and the interests on the sea is directly related to the core benefits of the country.However,the extreme complexity of the ocean has brought a great challenge to the understanding of the ocean,the Malaysia Airlines incident has fully proved the urgency to improve the cognitionof the ocean.Understanding the law of the motion of the marine environmental elements is a prerequisite for the understanding of the ocean.As an important part of the marine environment,the marine environmental elements,which has a profound impact on the maritime operations,maritime security,maritime warning and other military missions.How to analyze and calculate the movement of the marine environmental elements and how to display the whole process of the movement of the ocean environment,have become the bottleneck problem of study and understand the marine environmental elements.Therefore,it is very significant to study the motion characteristics analysis and visualization of marine environmental elements.In this paper,four aspects which are the analysis and fast calculation method of marine environmental factors,the fluid-solid coupling calculation of marine environmental elements based on the fast analysis method,the 3D-visualization of the marine environmental factors based on the visual comfort,and the 3D-visualization system of marine environmental factors,are concerned about.In view of the existing problems,the ideas and methods are proposed.The main work of this paper is as follows:(1)Aimed at the analysis and calculation of the marine environmental elements,because the speed of the SPH calculation is slow and the efficiency is low,a new method for the analysis and fast calculation of marine environmental factors based on Right Neighbour Cell is proposed.Firstly,the kernel functions are seclected based on classical medthods,then the RNC particle search algorithm is introduced.Finally,the process of RNC numerical processing is optimized by artificial compression ratio,boundary treatment,time integration and so on.Experimental results show that the when particle number is large,the RNC methodology significantly improves the particle rendering frame rate and it is effective in numerical calculation.(2)Aimed at the elements of the marine environment and the interaction of objects,especially the coupling problems of fluid-solid,a new method based on RNC is proposed.Firstly,the research method of fluid solid coupling problem is analyzed,then the initial settings of RNC method,and the stress analysis of the fluid and the solid,and the collision detection,and the iterative process are described in detail.Finally the dam break simulation and fluid and block coupling motion simulation have been designed.Experimental results show that the method can effectively calculate and analyze the fluid-solid coupling problem.(3)Aimed at the visualization of complex marine environmental elements,due to the problem which large scale particle motion and display efficiency is low,a new method of marine environment elements stereo display based on visual comfort is proposed.Firstly,the projection of stereo display models is introduced,and the visual comfort degree is analyzed and calculated,and observation model analysis and calculation are introduced and studied.Experimental results show that the method can effectively analyze the optimal stereo display observation position,the particle is clear and effective.(4)A visualization system for marine environmental elements has been designed and implemented,including the system of object modeling,system structure,functional framework,running process,and so on.At last,the main interface subsystems.the numerical analysis son system,and the visualization son system have been realized. |
PDF Full Text Request