Pattern formation and dynamic transition for magnetohydrodynamic convection

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November 2014, 13(6): 2609-2639. doi: 10.3934/cpaa.2014.13.2609

Pattern formation and dynamic transition for magnetohydrodynamic convection

Taylan Sengul ^1, and Shouhong Wang ^2,

1.	Department of Mathematics, Purdue University, West Lafayette, IN 47906, United States
2.	Department of Mathematics, Indiana University, Bloomington, IN 47405

Received June 2013 Revised November 2013 Published July 2014

Abstract
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The main objective of this paper is to describe the dynamic transition of the incompressible MHD equations in a three dimensional (3D) rectangular domain from a perspective of pattern formation. We aim to classify the formations of roll, rectangle and hexagonal patterns at the first critical Rayleigh number.

When the first eigenvalue of the linearized operator is real and simple, the critical eigenvector has either a roll structure or a rectangle structure. In both cases we find that the transition is continuous or jump depending on a non-dimensional number computed explicitly in terms of system parameters.

When the critical eigenspace has dimension two corresponding to two real eigenvalues, we study the transitions of hexagonal pattern. In this case, we show that all three types of transitions--continuous, jump and mixed--can occur in eight different transition scenarios.

Finally, we study the case where the first eigenvalue is complex, simple and corresponding eigenvector has a roll structure. In this case, we find that both continuous and jump transitions are possible.

We give several bounds on the parameters which separate the parameter space into regions of different transition scenarios.

Keywords: pattern formation, hexagonal pattern, metastability., dynamic transition, Magnetohydrodynamic convection.

Mathematics Subject Classification: Primary: 76W05, 35Q35, 35B3.

Citation: Taylan Sengul, Shouhong Wang. Pattern formation and dynamic transition for magnetohydrodynamic convection. Communications on Pure and Applied Analysis, 2014, 13 (6) : 2609-2639. doi: 10.3934/cpaa.2014.13.2609

References:

[1]	Subrahmanyan Chandrasekhar, Hydrodynamic and Hydromagnetic Stability, Clarendon Press, Oxford, 1961.
[2]	Michael C. Cross and Pierre C. Hohenberg, Pattern formation outside of equilibrium, Reviews of Modern Physics, 65 (1993), 851-1112.
[3]	Alexander V. Getling, Rayleigh-Bénard Convection: Structures and Dynamics, World Scientific, River Edge, 1998.
[4]	Ernst L. Koschmieder, Bénard Cells and Taylor Vortices, Cambridge University Press, New York, 1993.
[5]	Tian Ma and Shouhong Wang, Bifurcation Theory and Applications, Hackensack, World Scientific Publishing, 2005. doi: 10.1142/9789812701152.
[6]	Tian Ma and Shouhong Wang, Phase Transition Dynamics, Springer-Verlag, New York, 2013.
[7]	M. R. E. Proctor and N. O. Weiss, Magnetoconvection, Reports on Progress in Physics, 45 (1982), 1317-1379.
[8]	Roger Temam, Infinite-Dimensional Dynamical Systems in Mechanics and Physics, $2^{nd}$ edition, Springer-Verlag, New York, 1997.

show all references

References:

[1]	Subrahmanyan Chandrasekhar, Hydrodynamic and Hydromagnetic Stability, Clarendon Press, Oxford, 1961.
[2]	Michael C. Cross and Pierre C. Hohenberg, Pattern formation outside of equilibrium, Reviews of Modern Physics, 65 (1993), 851-1112.
[3]	Alexander V. Getling, Rayleigh-Bénard Convection: Structures and Dynamics, World Scientific, River Edge, 1998.
[4]	Ernst L. Koschmieder, Bénard Cells and Taylor Vortices, Cambridge University Press, New York, 1993.
[5]	Tian Ma and Shouhong Wang, Bifurcation Theory and Applications, Hackensack, World Scientific Publishing, 2005. doi: 10.1142/9789812701152.
[6]	Tian Ma and Shouhong Wang, Phase Transition Dynamics, Springer-Verlag, New York, 2013.
[7]	M. R. E. Proctor and N. O. Weiss, Magnetoconvection, Reports on Progress in Physics, 45 (1982), 1317-1379.
[8]	Roger Temam, Infinite-Dimensional Dynamical Systems in Mechanics and Physics, $2^{nd}$ edition, Springer-Verlag, New York, 1997.

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