Global Well-Posedness of Second-Grade Fluid Equations in 2D Exterior Domain

In this article, we consider 2D second grade fluid equations in exterior domain with Dirichlet boundary conditions. For initial data $\boldsymbol{u}_0 \in \boldsymbol{H}^3(\Omega)$, the system is shown to be global well-posed. Furthermore, for arbitrary $T > 0$ and $s \geq 3$, prove that solution belongs $L^\infty([0, T]; \boldsymbol{H}^s(\Omega))$ provided $\boldsymbol{u}_0$ $\boldsymbol{H}^s(\Omega)$.