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arXiv 2102.06348math.AP
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三维有界域中具有滑移边界条件的可压缩Navier-Stokes方程全局经典解的存在性与指数增长

Existence and Exponential Growth of Global Classical Solutions to the Compressible Navier-Stokes Equations with Slip Boundary Conditions in 3D Bounded Domains

Guocai Cai, Jing Li

AI总结:

本文证明了三维有界域中带滑移边界条件的可压缩Navier-Stokes方程在初始能量小且密度含真空时,弱解与经典解全局存在,且真空出现时密度振荡呈指数增长。

摘要:

我们研究在三维(3D)单连通有界域中具有滑移边界条件的正压可压缩Navier-Stokes方程,该域的光滑边界具有有限个二维连通分量。对于任意大于1的绝热指数,在发现了与滑移边界条件相关的边界积分的一些新估计之后,我们证明:若初始能量适当小,则该系统的初边值问题的弱解和经典解均在时间上全局存在。此外,密度具有大振荡并包含真空状态。最后,还证明了对于经典解,若初始时出现真空(即使仅在一点),则密度的振荡在长期内将以指数速率无界增长。这是关于在一般三维有界光滑域上,初始密度包含真空状态的可压缩Navier-Stokes方程经典解全局存在的首个结果。

英文摘要:

We investigate the barotropic compressible Navier-Stokes equations with slip boundary conditions in a three-dimensional (3D) simply connected bounded domain, whose smooth boundary has a finite number of two-dimensional connected components. For any adiabatic exponent bigger than one, after discovering some new estimates on boundary integrals related to the slip boundary condition, we prove that both the weak and classical solutions to the initial-boundary-value problem of this system exist globally in time provided the initial energy is suitably small. Moreover, the density has large oscillations and contains vacuum states. Finally, it is also shown that for the classical solutions, the oscillation of the density will grow unboundedly in the long run with an exponential rate provided vacuum appears (even at a point) initially. This is the first result concerning the global existence of classical solutions to the compressible Navier-Stokes equations with density containing vacuum states initially for general 3D bounded smooth domains.

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