Long-time behaviour of two-dimensional Navier-Stokes equations in the presence of Couette flow on the half plane

Abstract

In this paper, we study the long-time behavior of solutions to the two-dimensional Navier-Stokes equations in the presence of Couette flow on the half plane with Navier-slip boundary conditions. We prove that the total vorticity will approach \begin{align*} -1+\frac{M_2(ω_{0})}{ν^{3/2}(1+t)^{5/2}} \barΩ\left( \frac{x}{\sqrt{ν(1+t)^3}}, \frac{y}{\sqrt{ν(1+t)}} \right), \end{align*} where $-1$ is the vorticity of the Couette flow and $\barΩ$ is the kernel of a Fokker-Planck type operator $\mathcal{L}=\partial_Y^2+\frac32 X\partial_X+\frac12 Y\partial_Y+\frac52-Y\partial_X$. In the proof, we introduce a new idea of studying the spectrum of such type operators with boundary.