How to obtain an accurate gradient for interface problems?
How to obtain an accurate gradient for interface problems?
复制标题
如何获得界面问题的准确梯度?
DOI:
10.1016/j.jcp.2019.109070
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发表时间:
2020-03
影响因子:
4.1
通讯作者:
Li Zhilin
中科院分区:
文献类型:
--
作者:
Tong Fenghua;Wang Weilong;Feng Xinlong;Zhao Jianping;Li Zhilin
It is well-known that the Immersed Interface Method (IIM) is second order accurate for interface problems. But the accuracy of the first order derivatives, or gradients for short, is not so clear and is often assumed to be first order accurate. In this paper, new strategies based on IIM are proposed for elliptic interface problems to compute the gradient at grid points both regular and irregular, and at the interface from each side of the interface. Second order in 1D, or nearly second order (except a factor of| log h|) convergence in 2D of the computed gradient is obtained with almost no extra cost, and has been explained in intuition and verified by non-trivial numerical tests. Numerical examples in one, two dimensions, radial and axis-symmetric cases in polar and spherical coordinates are presented to validate the numerical methods and analysis.
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DOI:
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期刊:
Symposia of the Society for Experimental Biology
影响因子:
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作者:
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影响因子:
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