The adaptive mesh method based on HOC difference scheme for convection diffusion equations with boundary layers

The adaptive mesh method based on HOC difference scheme for convection diffusion equations with boundary layers
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基于HOC差分格式的边界层对流扩散方程自适应网格法

DOI:
10.1007/s40314-016-0412-y
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发表时间:
2017-01
影响因子:
2.6
通讯作者:
Yongbin Ge
Yongbin Ge
中科院分区:
数学4区
文献类型:
--
作者:
Fujun Cao;Yongfang Yuan;Yongbin Ge

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提出了一种二维矩形计算域正交非均匀网格的自适应网格生成方法。该算法采用维度分割思想,在各个方向上依次重新分配网格。该方法有效地降低了算法的难度,并使自适应网格具有正交性。自适应网格法可以在不指定边界层位置和网格分布函数的情况下,根据解对网格进行重新分布,从而提前生成非均匀网格。为了验证算法的有效性和鲁棒性,将该方法与非均匀网格上的HOC差分格式结合,求解了一维和二维边界层对流扩散问题。此外,采用多重网格法加快了迭代收敛速度。在边界层位置事先未知的情况下,自适应网格法的数值解比均匀或非均匀网格法更灵活。
In this paper, an adaptive mesh method is proposed to generate orthogonal nonuniform mesh for 2D rectangular computational domain. The algorithm adopts the dimension split idea which redistribute the mesh on each direction sequently. This approach efficiently decreases the difficultly of algorithm and enables the adapted mesh to be orthogonal. The adaptive mesh method can redistribute the mesh based on the solution without specifying the location of the boundary layer or the grid distribution function to generate the nonuniform mesh in advance. To verify the effectiveness and robustness of the algorithm, the presented method combined with the HOC difference scheme on nonuniform grid is used to solve the 1D and 2D convection diffusion problems with boundary layers. Besides, the multigrid method is used to accelerate the iterative convergence speed. The numerical solutions of adaptive mesh is more flexible than uniform or nonuniform grids methods if the location of the boundary layers is unknown in advance.
DOI: 10.1016/j.jcp.2011.02.027
发表时间: 2011-05
期刊: J. Comput. Phys.
影响因子: --
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