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arXiv 2402.07201math.AP
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关于Navier-Stokes-Korteweg模型中毛细作用对Rayleigh-Taylor不稳定性的抑制

On the Inhibition of Rayleigh Taylor Instability by Capillarity in the Navier Stokes Korteweg Model

Fei Jiang, Yajie Zhang, Zhipeng Zhang

AI总结:

本文严格证明了在非线性不可压缩Navier-Stokes-Korteweg方程中,当毛细系数超过阈值时,毛细作用可抑制Rayleigh-Taylor不稳定性,通过捕捉密度切向导数的耗散估计实现速度与密度扰动的衰减。

摘要:

Bresch--Desjardins--Gisclon--Sart在2008年基于线性化的不可压缩Navier--Stokes--Korteweg(NSK)方程推导出,毛细作用会减缓具有内部毛细作用的不均匀不可压缩流体中Rayleigh--Taylor(RT)不稳定性的增长率。随后,Li--Zhang在2023年(SIAM J. Math. Anal. 3287--3315)同样基于线性化方程获得了另一结果:当毛细系数大于某个阈值时,毛细作用会抑制RT不稳定性。在本文中,我们进一步严格证明了在水平周期板状区域中,具有Navier(滑移)边界条件的非线性不可压缩NSK方程中毛细作用抑制RT不稳定性的现象。证明的关键思想是捕捉密度切向导数的耗散估计。这种耗散估计导致速度和扰动密度随时间衰减,这对于克服非线性项带来的困难非常有用。

英文摘要:

Bresch--Desjardins--Gisclon--Sart had derived that the capillarity slows down the growth rate of Rayleigh--Taylor (RT) instability in an inhomogeneous incompressible fluid endowed with internal capillarity based on a linearized incompressible Navier--Stokes--Korteweg (NSK) equations in 2008. Later Li--Zhang further obtained another result that the capillarity inhibits RT instability also based on the linearized equations in (SIAM J. Math. Anal. 3287--3315, 2023), if the capillarity coefficient is bigger than some threshold. In this paper, we further rigorously prove such phenomenon of capillarity inhibiting the RT instability in the \emph{nonlinear} incompressible NSK equations in a horizontally periodic slab domain with Navier (slip) boundary conditions. The key idea in the proof is to capture the dissipative estimates of the tangential derivatives of density. Such dissipative estimates result in the decay-in-time of both the velocity and the perturbation density which is very useful to overcome the difficulties arising from the nonlinear terms.

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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