【摘要】：潮流的數(shù)值模擬是海洋科學(xué)研究中一個(gè)重要的技術(shù)方法,已成為海岸工程、環(huán)境工程中了解潮流的重要且有效的手段。通過潮流的數(shù)值模擬能更好的指導(dǎo)海岸海洋的管理、開發(fā)與應(yīng)用。潮流數(shù)值計(jì)算是在離散的計(jì)算網(wǎng)格上進(jìn)行的,因此采用合適的計(jì)算網(wǎng)格對數(shù)值計(jì)算成敗起著至關(guān)重要的作用。潮流數(shù)值模型的計(jì)算量大,耗時(shí)較長,因此實(shí)時(shí)監(jiān)視和控制計(jì)算過程是非常重要和必須的手段。由于潮流數(shù)值模擬數(shù)據(jù)量較大,如何全面且高效地展現(xiàn)數(shù)據(jù)中所蘊(yùn)含的信息是可視化研究領(lǐng)域的一個(gè)熱點(diǎn)。 本文針對當(dāng)前潮流數(shù)值模擬過程中亟待改進(jìn)的地方,提出了潮流自適應(yīng)仿真模擬,并進(jìn)行了相關(guān)的研究。在計(jì)算網(wǎng)格生成研究中,引入了顧及地形特征的自適應(yīng)網(wǎng)格生成技術(shù),通過提取地形坡度值和海岸邊界曲率作為控制尺寸的依據(jù)。在潮流數(shù)值模型研究中,本文使用了FVCOM潮流模型中的水動(dòng)力模塊。并設(shè)計(jì)了一種動(dòng)態(tài)監(jiān)控機(jī)制,對模型計(jì)算過程進(jìn)行跟蹤并在需要時(shí)予以控制。研究了自適應(yīng)可視化技術(shù),根據(jù)數(shù)據(jù)屬性和用戶選擇對數(shù)據(jù)進(jìn)行精煉和選擇,減少無關(guān)信息,提高了可視化效率并增強(qiáng)了數(shù)據(jù)的表現(xiàn)力。取得的成果如下： (1)通過提取地形坡度值作為控制尺寸的依據(jù),對海岸邊界按照曲率進(jìn)行離散,并借助背景網(wǎng)格法和AFT網(wǎng)格生成技術(shù),自動(dòng)生成顧及地形特征又能滿足模型計(jì)算精度要求的變密度網(wǎng)格。 (2)設(shè)計(jì)了動(dòng)態(tài)監(jiān)控機(jī)制,實(shí)現(xiàn)了計(jì)算過程中的數(shù)據(jù)跟蹤監(jiān)視、計(jì)算干預(yù)和參數(shù)調(diào)整,提高了模型的計(jì)算效率和自動(dòng)化程度。 (3)實(shí)現(xiàn)了水下地形、潮流、潮間帶等動(dòng)態(tài)可視化,并研究了融合顯示、流場數(shù)據(jù)抽稀、LOD等技術(shù),提高了渲染效率并增強(qiáng)了數(shù)據(jù)的表現(xiàn)力。 最后在潮流模型、自適應(yīng)可視化技術(shù)、動(dòng)態(tài)監(jiān)控研究的基礎(chǔ)上實(shí)現(xiàn)了潮流模型仿真模擬原型系統(tǒng),并通過實(shí)例驗(yàn)證了本文研究的可行性和有效性。
[Abstract]:Numerical simulation of tidal current is an important technical method in marine scientific research. It has become an important and effective means to understand tidal current in coastal engineering and environmental engineering. Numerical simulation of tidal current can better guide coastal ocean management, development and application. The numerical calculation of power flow is carried out on the discrete grid, so it is very important to use the appropriate grid for the success or failure of the numerical calculation. The calculation of the numerical model of power flow is large and time-consuming, so real-time monitoring and controlling the calculation process is very important and necessary. Because of the large amount of data in numerical simulation of power flow, how to display the information contained in the data comprehensively and efficiently is a hot topic in the field of visualization. In this paper, the adaptive simulation of power flow is put forward and the relevant research is carried out in order to improve the process of numerical simulation of power flow. In the research of computational mesh generation, an adaptive mesh generation technique, which takes into account the terrain features, is introduced. The slope value and the curvature of the coastal boundary are extracted as the basis for the control of the size. In the research of numerical model of power flow, the hydrodynamic module of FVCOM power flow model is used in this paper. A dynamic monitoring mechanism is designed to track and control the model calculation process. The adaptive visualization technology is studied to refine and select the data according to the data attributes and user selection, which can reduce the irrelevant information, improve the visualization efficiency and enhance the performance of the data. The results obtained are as follows: (1) the coastal boundary is discretized according to the curvature by extracting the slope value of the terrain as the basis for controlling the size, and the background mesh method and AFT mesh generation technology are used. Automatic generation of variable density meshes that take into account terrain features and meet the requirements of computational accuracy of the model. (2) the dynamic monitoring mechanism is designed to realize the data tracking and monitoring, calculation intervention and parameter adjustment in the calculation process, and the calculation efficiency and automation degree of the model are improved. (3) dynamic visualization of underwater topography, tidal current and intertidal zone is realized, and fusion display, flow field data thinning and LOD are studied. The rendering efficiency is improved and the performance of data is enhanced. Finally, based on the research of power flow model, adaptive visualization technology and dynamic monitoring, the simulation prototype system of power flow model is implemented, and the feasibility and effectiveness of this study are verified by an example.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P731.23

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