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arXiv 2003.05801math.AP
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$L_q$ -空间中一致$C^{2,1}$ -域上部分滑移的Stokes和斯托克斯方程

Stokes and Navier-Stokes equations subject to partial slip on uniform $C^{2,1}$-domains in $L_q$-spaces

Pascal Hobus, Jürgen Saal

摘要:

本文讨论了Stokes方程和Navier-斯托克斯方程在$L_q$上的一致$C^{2,1}$ -域上的适定性.特别地,非亥姆霍兹域的类别,即,域的Helmholtz分解不存在,寻址。一方面,证明了部分滑移条件下的斯托克斯方程在Helmholtz域的标准解中是不适定的。另一方面,证明了在一定的合理假设下,具有部分滑移的Stokes方程和Navier-斯托克斯方程在广义情形下是适定的。这种设置依赖于一个广义版本的亥姆霍兹分解存在于适当的条件下的交集和总和的梯度和螺线管领域的$L_q$。证明的适定性的斯托克斯预解问题甚至变成等价于广义亥姆霍兹分解的存在。所提出的方法,例如,包括扇区般的非亥姆霍兹域Bogovski \u和Maslennikova以及进一步广泛的类均匀$C^{2,1}$域。

英文摘要:

This note concerns well-posedness of the Stokes and Navier-Stokes equations on uniform $C^{2,1}$-domains on $L_q$. In particular, classes of non-Helmholtz domains, i.e., domains for which the Helmholtz decomposition does not exist, are adressed. On the one hand, it is proved that the Stokes equations subject to partial slip in general are not well-posed in the standard setting that usually applies for Helmholtz domains. On the other hand, it is proved that under certain reasonable assumptions the Stokes and Navier-Stokes equations subject to partial slip are well-posed in a generalized setting. This setting relies on a generalized version of the Helmholtz decomposition which exists under suitable conditions on the intersection and the sum of gradient and solenoidal fields in $L_q$. The proved well-posedness of the Stokes resolvent problem turns even out to be equivalent to the existence of the generalized Helmholtz decomposition. The presented approach, for instance, includes the sector-like non-Helmholtz domains introduced by Bogovski\uı and Maslennikova as well as further wide classes of uniform $C^{2,1}$-domains.

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