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arXiv 2409.06602math.AP
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角点奇异性在不可压缩极限中的收敛性

Convergence in the incompressible limit of the corner singularities

Hyung Jun Choi, Seonghak Kim, Youngwoo Koh

AI总结:

本文研究消去压力后的 Stokes 惩罚系统在不可压缩极限下的角点奇异性,建立 Lamé 与 Stokes 问题奇异系数公式并证明其收敛性。

摘要:

在本文中,我们处理关于惩罚系统的角点奇异性展开及其收敛结果,该系统是通过在不可压缩流动的 Stokes 问题中消去压力变量而得到的。该惩罚问题是一种 Lamé 系统,因此我们首先讨论在非凸多边形上具有非齐次 Dirichlet 边界条件的 Lamé 系统的角点奇异性理论。考虑到非齐次条件,我们展示了其解的分解,该分解由凹角附近的奇异部分和更光滑的余项组成,此外,我们给出了奇异部分中系数的显式公式。特别地,这些公式可用于开发高精度数值格式。此外,我们针对具有非齐次边界条件和速度场非无散特性的 Stokes 方程,建立了奇异部分中系数的表达式,从而展示了所考虑惩罚问题的奇异部分和余项中系数的收敛结果。

英文摘要:

In this paper, we treat the corner singularity expansion and its convergence result regarding the penalized system obtained by eliminating the pressure variable in the Stokes problem of incompressible flow. The penalized problem is a kind of the Lamé system, so we first discuss the corner singularity theory of the Lamé system with inhomogeneous Dirichlet boundary condition on a non-convex polygon. Considering the inhomogeneous condition, we show the decomposition of its solution, composed of singular parts and a smoother remainder near a re-entrant corner, and furthermore, we provide the explicit formulae of coefficients in singular parts. In particular, these formulae can be used in the development of highly accurate numerical scheme. In addition, we formulate coefficients in singular parts regarding the Stokes equations with inhomogeneous boundary condition and non-divergence-free property of velocity field, and thus we show the convergence results of coefficients in singular parts and remainder regarding the concerned penalized problem.

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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