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Title: A study on the global well-posedness for the two-dimensional Boussinesq and Lans-Alpha Magnetohydrodynamics equations
Authors: K.C., Durga Jang
Keywords: Boussinesq-Navier-Stokes equations
2D Euler-Boussinesq equations
Boussinesq equations
Lans- Magnetohydrodynamics system
Issue Date: 21-Feb-2018
Abstract: We investigate the global (in time) regularity problem for two di erent models; generalized two-dimensional Boussinesq and Lans-alpha magnetohydrodynamics system. First, the global regularity of 2D incompressible generalized Euler-Boussinesq equations has been studied. We establish the global existence and uniqueness of solutions to the initial-value problem when the velocity eld is \double logarithmically" more singular than the one given by the Biot-Savart law.This global regularity result goes beyond the critical case. Secondly, we consider the two-dimensional Navier-Stokes- Boussinesq equations with logarithmically super-critical dissipation. By implementing Besov space technique, the global well-posedness of initial value problem is established. These results improve the existing results of super-critical Boussinesq system of equations. Finally, we study the two-dimensional generalized Lans-alpha magnetohydrodynamics system. We mainly focus on Lans-alpha magnetohydrodynamics system of equations with logarithmically weaker dissipation than full dissipation together with zero di usion or zero dissipation and logarithmically weaker di usion than full di usion. In both cases, we are successful to resolve global regularity issues.
Description: Submitted to the faculty of the Graduate College of Oklahoma State University in partial fulfillment of the requirements for the Degree of Doctor of Philosophy, 2014.
Appears in Collections:500 Natural sciences and mathematics

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