Journal
PHYSICS LETTERS A
Volume 381, Issue 41, Pages 3568-3575Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2017.09.020
Keywords
Hyperbolic heat propagation model; Generalized Lorenz system; Hysteresis; Heteroclinic loop; Shil'nikov chaos
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Funding
- CSIR, New Delhi, India [09/025(0212)/2014-EMR-I]
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In this Letter, we report the influences of thermal time-lag on the onset of convection, its bifurcations and chaos of a horizontal layer of Boussinesq fluid heated underneath taking non-Fourier CattaneoChristov hyperbolic model for heat propagation. A five-dimensional nonlinear system is obtained for a low-order Galerkin expansion, and it reduces to Lorenz system for Cattaneo number tending to zero. The linear stability agreed with existing results that depend on Cattaneo number C. It also gives a threshold Cattaneo number, CT, above which only oscillatory solutions can persist. The oscillatory solutions branch terminates at the subcritical steady branch with a heteroclinic loop connecting a pair of saddle points for subcritical steady-state solutions. For subcritical onset of convection two stable solutions coexist, that is, hysteresis phenomenon occurs at this stage. The steady solution undergoes a Hopf bifurcation and is of subcritical type for small value of C, while it becomes supercritical for moderate Cattaneo number. The system goes through period-doubling/noisy period-doubling transition to chaos depending on the control parameters. There after the system exhibits Shil'nikov chaos via homoclinic explosion. The complexity of spiral strange attractor is analyzed using fractal dimension and return map. (C) 2017 Elsevier B.V. All rights reserved.
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