Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11001757 | Physica D: Nonlinear Phenomena | 2018 | 41 Pages |
Abstract
Using a perturbation method, we solve asymptotically the nonlinear partial differential equations that govern double-diffusive convection (with heat and solute diffusing) in a two-dimensional rectangular domain near a critical point in parameter space where the linearized operator has a quadruple-zero eigenvalue. The asymptotic solution near this codimension-four point is found to depend on two slow-time-dependent amplitudes governed by two nonlinearly-coupled Van der Pol-Duffing equations. Through numerical approximation of the 3-dimensional Poincaré map in the four-dimensional state space of the amplitude equations, we detect and analyze the bifurcations of the amplitude equations as the thermal Rayleigh number, RT, is increased (for RSâªRT, the solute Rayleigh number) with all other parameters fixed. The bifurcations observed include: Hopf, pitchfork and Neimark-Sacker bifurcations of limit cycles, symmetric and asymmetric saddle-node bifurcations of 2-tori, and reverse torus-doubling cascades. In addition, chaotic solutions are found numerically to emerge via two different types of routes: (1) a route involving a homoclinic explosion in the Poincaré map and; (2) type-I intermittency routes near saddle-node bifurcations of 2-tori. The homoclinic explosion occurs when two unstable 2-tori form homoclinic connections with a saddle limit cycle, thereby creating a homoclinic butterfly in the Poincaré map that leads to a discrete Lorenz-like attractor.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Applied Mathematics
Authors
Justin S. Eilertsen, Jerry F. Magnan,