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arXiv 2301.04403math.NAcs.NA
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“好”Boussinesq方程的半离散一阶低正则指数积分器

A semi-discrete first-order low regularity exponential integrator for the "good" Boussinesq equation without loss of regularity

Hang Li, Chunmei Su

摘要:

在本文中,我们提出了一个半离散的一阶低正则指数型积分器(LREI)的“好”Boussinesq方程。结果表明,对于属于$H^{r+p(r)}$的解,该方法在$H^r$空间中线性收敛,其中$0\le p(r)\le 1$相对于$r$是非增的,这意味着当数值解在更正则空间中测量时,可能需要更少的附加导数.特别地,LREI在$H^{r}$中呈现了一阶精度,当$r>5/2$时没有附加导数的假设。这是第一次提出了一种低正则性的方法,实现了最佳的一阶精度,而不损失的GB方程的正则性。通过大量的数值实验证实了收敛性。

英文摘要:

In this paper, we propose a semi-discrete first-order low regularity exponential-type integrator (LREI) for the ``good" Boussinesq equation. It is shown that the method is convergent linearly in the space $H^r$ for solutions belonging to $H^{r+p(r)}$ where $0\le p(r)\le 1$ is non-increasing with respect to $r$, which means less additional derivatives might be needed when the numerical solution is measured in a more regular space. Particularly, the LREI presents the first-order accuracy in $H^{r}$ with no assumptions of additional derivatives when $r>5/2$. This is the first time to propose a low regularity method which achieves the optimal first-order accuracy without loss of regularity for the GB equation. The convergence is confirmed by extensive numerical experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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