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- W4320233906 abstract "Bresch-Desjardins-Gisclon-Sart have derived that the capillarity can slow {down} the growth rate of Rayleigh-Taylor (RT) instability in the capillary fluids based on the linearized two-dimensional (2D) Navier-Stokes-Korteweg equations in 2008. Motivated by their linear theory, we further investigate the nonlinear RT problem for the 2D incompressible case in a horizontally periodic slab domain with Navier boundary condition, and rigorously verify that the RT instability can be inhibited by capillarity under our 2D setting. More precisely, if the RT density profile $bar{rho}$ satisfies an additional stabilizing condition, then there is a threshold $kappa_{C}$ of capillarity coefficient, such that if the capillarity coefficient $kappa$ is bigger than $kappa_{C}$, then the small perturbation solution around the RT equilibrium state is emph{algebraically} stable in time. In particular, if the RT density profile is linear, then the threshold $kappa_{C}$ can be given by the formula $kappa_{C}=g /(pi^2h^{-2}+L^{-2})bar{rho}'$, where $2pi L$ denotes the length of a periodic cell of the slab domain in the horizontal direction, and $h$ the height of the slab domain. In addition, we also provide a nonlinear instability result for $kappain[0,kappa_{C})$. The instability result presents that the capillarity can not inhibit the RT instability, if its strength is too small." @default.
- W4320233906 created "2023-02-13" @default.
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- W4320233906 date "2023-02-02" @default.
- W4320233906 modified "2023-09-23" @default.
- W4320233906 title "On Stability and Instability of Gravity Driven Navier-Stokes-Korteweg Model in Two Dimensions" @default.
- W4320233906 doi "https://doi.org/10.48550/arxiv.2302.01013" @default.
- W4320233906 hasPublicationYear "2023" @default.
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