The 2D Boussinesq equations with vertical viscosity and vertical diffusivity

Abstract

This paper aims at the global regularity of classical solutions to the 2D Boussinesq equations with vertical dissipation and vertical thermal diffusion. We prove that the L r -norm of the vertical velocity v for any 1 < r < ∞ is globally bounded and that the L ∞ -norm of v controls any possible breakdown of classical solutions. In addition, we show that an extra thermal diffusion given by the fractional Laplace ( − Δ ) δ for δ > 0 would guarantee the global regularity of classical solutions.