Stability threshold for two-dimensional Boussinesq systems near-Couette shear flow in a finite channel

Abstract

In this paper, we investigate the stability threshold problem of the two-dimensional Navier-Stokes Boussinesq(NSB) equations in a finite channel $ \T \times [-1,1]$, focusing on the stability around the near Couette shear flow $(U(y),0)$, assuming the Navier slip boundary conditions are satisfied. In particular, when the initial data for the vorticity resides in an anisotropic Sobolev space of size $O(\min \{{\mu }^{\frac{1}{2}},{\nu }^{\frac{1}{2}}\})$, and the initial perturbation of the temperature resides in an anisotropic Sobolev space of size $O(\min \{\mu ,\nu \})$, we derive the nonlinear enhanced dissipation effect and the inviscid damping effect for the NSB system.