Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	江飞教授，福州大学
Inviter:
Title:	On the Inhibition of Rayleigh-Taylor Instability by Capillarity in the Navier-Stokes-Korteweg Model
Language:	Chinese
Time & Venue:	2024.03.28 11:00-12:00 思源楼803
Abstract:	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 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.