Automatic triangular and triangular-prism mesh generation for overland and subsurface water flow simulations

Automatic triangular and triangular-prism mesh generation for overland and subsurface water flow simulations
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自动生成三角形和三棱柱网格,用于陆上和地下水流模拟

DOI:
10.1063/1.5144422
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发表时间:
2020-05
期刊:
影响因子:
4.6
通讯作者:
Gour-Tsyh Yeh
Gour-Tsyh Yeh
中科院分区:
工程技术2区
文献类型:
--
作者:
Lu Sun;Guoqun Zhao;Gour-Tsyh Yeh

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在本文中,一个自动网格生成器的开发,以模拟流域系统中的密度依赖的水流和输运问题。采用Delaunay三角剖分法生成二维三角网格,采用垂直拉伸法生成三维三棱柱网格。根据一维河流、二维地面流和三维地下流的相互作用方案,对网格划分的实现过程进行了调整。提出了一种改进的边界点生成算法,根据河段和死角的离散模式,保持点和边的适当对应。在零宽河段和零宽交叉口上生成重叠节点,建立二维陆面模拟的数值模型。提出了一种附加三角形网格生成方法,用于生成附加三角形,以填充有限宽河段、有库枢纽、有限宽河段等的空水域。
In this paper, an automatic mesh generator is developed to simulate density-dependent water flow and transport problems in watershed systems. The two-dimensional (2D) triangular mesh is generated by global Delaunay triangulation, and the three-dimensional (3D) triangular-prism mesh is generated by vertical stretch. The implementation procedures of mesh generation are adjusted according to the interaction options of one-dimensional (1D) river, 2D overland, and 3D subsurface flows. An improved boundary point generation algorithm is proposed to maintain appropriate correspondence of points and edges according to the discrete patterns of river reaches and dead ends. Overlapped nodes are generated on zero-width river reaches and zero-width junctions without storage to construct the numerical models for 2D overland simulations. An additional triangular mesh generation method is proposed to create additional triangles for filling the empty water zones of finite-width river reaches, junctions with storage, finite...
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