Seminario: “Convection in magnetic fluids”

6 junio, 2017

Se invita cordialmente a participar del seminario titulado “Convection in Magnetic fluids”, que expondrá el Dr. David Laroze, adscrito al Instituto de Alta Investigación de la Universidad de Tarapacá y Profesor Visitante de nuestro Programa. La cita es el viernes 09 de junio, 11:00 hrs., en la sala CF-110 del Departamento de Ciencias Físicas, Universidad de La Frontera.


                                     “Convection in magnetic fluids”

We report theoretical and numerical results on thermally driven convection of a magnetic suspension. The magnetic properties can be modeled as those of electrically non-conducting superparamagnets. We perform a truncated Galerkin expansion finding that the system can be described by a generalized Lorenz model [1]. We characterize the dynamical system using different criteria such as Fourier power spectrum, bifurcation diagrams, and Lyapunov exponents. We find that the system exhibits multiple transitions between regular and chaotic behaviors in the parameter space. Transient chaotic behavior in time can be found slightly below their linear instability threshold of the stationary state. Finally, we examine the generalized case when viscoelastic properties are taken into account [2].

[1] D. Laroze, P.G. Siddheshwar, H. Pleiner, Commun. Nonlinear Sci. Numer. Simulat. 18, 2436 (2013).
[2] D. Laroze, H. Pleiner, Commun. Nonlinear Sci. Numer. Simulat. 26, 167 (2015).