| 摘要: |
| 三维数学模型多应用于局部水域，无法模拟模型周边的大范围流场.为解决此问题，基于非结构网格有限体积法，建立了长江口二维三维潮流嵌套数学模型.模型嵌套边界采用近似处理方法，假设嵌套边界处网格单元分层水平流速服从多项式分布，该处理方法嵌套边界处的三维计算存在一定误差.将模型应用于长江口大范围水域潮流模拟计算.结果表明，潮位及二维三维潮流验证良好，计算精度满足规范要求，这说明该方法能够模拟大范围水域的二维及三维潮流运动. |
| 关键词: 非结构网格 FVM 二维三维数学模型 |
| DOI： |
| 分类号:TV131 |
| 基金项目:国家自然科学基金资助项目（51009095）；水利部公益性行业科研专项经费资助项目（201201070） |
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| 2D and 3D nested tidal current numerical simulation of Yangtze estuary based on finite volume method |
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LU Chuan-teng, CHEN Zhi-chang, LUO Xiao-feng
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State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering， Nanjing Hydraulic Research Institute
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| Abstract: |
| 3D numerical models are always used in simulating tidal flow field of local waters， but the vast flow field beyond the simulated area by 3D numerical model can not be simulated. In order to solve this problem， a 2D and 3D nested model for the Yangtze estuary is developed based on a finite volume method with unstructured grids. The flow field of boundary cells between 2D and 3D is handled with an approximation method which supposes that the 3D horizontal velocity of the boundary cells can meet the multinomial distribution， and there will be some calculation errors in the boundary cells. The model is used for the Yangtze estuary in simulating tidal flow movement. The simulated results show that the tidal level as well as 2D and 3D tidal currents are well verified by the numerical model, and the accuracy of calculation can meet the requirements of the norms and specifications. So this method can be used to simulate the 2D and 3D tidal current movement of large scale waters. |
| Key words: unstructured grid finite volume method (FVM) 2D & 3D numerical simulation |
