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<p>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 <i>linearized</i> incompressible Navier–Stokes–Korteweg (NSK) equations in 2008 (Ann. Univ. Ferrara Sez. 11–36, 2008). Later, Li–Zhang obtained another result that the capillarity inhibits the RT instability also based on the <i>linearized</i> 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 <i>nonlinear</i> 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 helpful to overcome the difficulties arising from the nonlinear terms.</p>

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On the inhibition of Rayleigh–Taylor instability by capillarity in the Navier–Stokes–Korteweg model

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Fei Jiang,
  • Yajie Zhang,
  • Zhipeng Zhang

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 (Ann. Univ. Ferrara Sez. 11–36, 2008). Later, Li–Zhang obtained another result that the capillarity inhibits the 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 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 helpful to overcome the difficulties arising from the nonlinear terms.