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arXiv 2210.05352math.NAcs.NA
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二维Lax-Wendroff格式的Neumann边界条件

The Neumann boundary condition for the two-dimensional Lax-Wendroff scheme

Jean-François Coulombel, Antoine Benoit

摘要:

我们研究了二维Lax-Wendroff格式的稳定性,该格式具有一个近似于输运方程解的稳定器。首先,在整个空间中的问题进行了分析,以表明,所谓的能量方法产生一个最佳的稳定性准则,这个有限差分格式。然后,我们处理的情况下,半空间时,运输运营商是外向的。在数值上,我们加强了Neumann外推边界条件,并表明相应的计划是稳定的。最后,我们分析的情况下,四分之一空间时,运输经营者是外向的两侧。然后,我们强制执行诺依曼外推边界条件的边界的每一侧,并提出了外推边界条件的数值角,以保持整个数值方案的稳定性。

英文摘要:

We study the stability of the two-dimensional Lax-Wendroff scheme with a stabilizer that approximates solutions to the transport equation. The problem is first analyzed in the whole space in order to show that the so-called energy method yields an optimal stability criterion for this finite difference scheme. We then deal with the case of a half-space when the transport operator is outgoing. At the numerical level, we enforce the Neumann extrapolation boundary condition and show that the corresponding scheme is stable. Eventually we analyze the case of a quarter-space when the transport operator is outgoing with respect to both sides. We then enforce the Neumann extrapolation boundary condition on each side of the boundary and propose an extrapolation boundary condition at the numerical corner in order to maintain stability for the whole numerical scheme.

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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