We address the asymptotic properties for the Boussinesq equations with vanishing thermal diffusivity in a bounded domain with no-slip boundary conditions. We show the dissipation of the L 2 norm of the velocity and its gradient, convergence of the L 2 norm of Au, and an o(1)-type exponential growth for A 3/2 u L 2 . We also obtain that in the interior of the domain the gradient of the vorticity is bounded by a polynomial function of time.
<p style='text-indent:20px;'>We address the global existence and uniqueness of solutions for the anisotropically reduced 2D Kuramoto-Sivashinsky equations in a periodic domain with initial data <inline-formula><tex-math id="M1">\begin{document}$ u_{01} \in L^2 $\end{document}</tex-math></inline-formula> and <inline-formula><tex-math id="M2">\begin{document}$ u_{02} \in H^{-1 + \eta} $\end{document}</tex-math></inline-formula> for <inline-formula><tex-math id="M3">\begin{document}$ \eta > 0 $\end{document}</tex-math></inline-formula>.</p>
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