arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1409.7323math.AP
收藏

$L^p$型临界空间中的不可压缩极限

The incompressible limit in $L^p$ type critical spaces

Raphaël Danchin, Lingbing He

摘要:

本文旨在证明不可压粘性可压缩流的Navier-斯托克斯方程在数据准备不充分的情况下的低马赫数收敛性。流体域可以是整个空间,也可以是环面。一些工程已致力于这一经典问题,所有这些都是,据我们所知,有关$L^2$空间和能源类型的论点。本文研究了$L^p$型临界正则性框架下的低马赫数收敛问题。更准确地说,在正压情况下,初始速度场的无发散部分只需在临界Besov空间$\dot B^{d/p-1}_{p,r}\cap\dot B^{-1}_{\infty,1}$中有界,以获得合适的$(p,r)\in[2,4]\times[1,+\infty].$。我们仍然需要速度势部分的低频和密度的$L^2$型界,尽管由于声波的存在,在准备不充分的数据框架中,这个假设似乎是不可避免的。在本文的最后一部分,我们的结果被推广到热传导流体的完整的Navier-Stokes系统。

英文摘要:

This paper aims at justifying the low Mach number convergence to the incompressible Navier-Stokes equations for viscous compressible flows in the ill-prepared data case. The fluid domain is either the whole space, or the torus. A number of works have been dedicated to this classical issue, all of them being, to our knowledge, related to $L^2$ spaces and to energy type arguments. In the present paper, we investigate the low Mach number convergence in the $L^p$ type critical regularity framework. More precisely, in the barotropic case, the divergence-free part of the initial velocity field just has to be bounded in the critical Besov space $\dot B^{d/p-1}_{p,r}\cap\dot B^{-1}_{\infty,1}$ for some suitable $(p,r)\in[2,4]\times[1,+\infty].$ We still require $L^2$ type bounds on the low frequencies of the potential part of the velocity and on the density, though, an assumption which seems to be unavoidable in the ill-prepared data framework, because of acoustic waves. In the last part of the paper, our results are extended to the full Navier-Stokes system for heat conducting fluids.

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。

↑