Invariant states in inclined layer convection. Part 1. Temporal transitions along dynamical connections between invariant states

Abstract

Thermal convection in an inclined layer between two parallel walls kept at different fixed temperatures is studied for fixed Prandtl number Pr=1.07. Depending on the angle of inclination and the imposed temperature difference, the flow exhibits a large variety of self-organized spatio-temporal convection patterns. Close to onset, these patterns have been explained in terms of linear stability analysis of primary and secondary flow states. At larger temperature difference, far beyond onset, experiments and simulations show complex, dynamically evolving patterns that are not described by stability analysis and remain to be explained. Here we employ a dynamical systems approach. We construct stable and unstable exact invariant states, including equilibria and periodic orbits of the fully nonlinear three-dimensional Oberbeck-Boussinesq equations. These invariant states underlie the observed convection patterns beyond their onset. We identify state-space trajectories that, starting from the unstable laminar flow, follow a sequence of dynamical connections between unstable invariant states until the dynamics approaches a stable attractor. Together, the network of dynamically connected invariant states mediates temporal transitions between coexisting invariant states and thereby supports the observed complex time-dependent dynamics in inclined layer convection.

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Cited by in corpus (10)

• Invariant states in inclined layer convection. Part 1. Temporal transitions along dynamical connections between invariant states
• Invariant states in inclined layer convection. Part 2. Bifurcations and connections between branches of invariant states
• Natural convection in a vertical channel. Part 1. Wavenumber interaction and Eckhaus instability in a narrow domain
• Jacobian-Free Variational Method for Constructing Connecting Orbits in Nonlinear Dynamical Systems
• Natural convection in a vertical channel. Part 2. Oblique solutions and global bifurcations in a spanwise-extended domain
• Ghost states underlying spatial and temporal patterns: how non-existing invariant solutions control nonlinear dynamics
• Stabilising nonlinear travelling waves in pipe flow using time-delayed feedback
• Longitudinal and transverse modes of temperature modulated inclined layer convection
• Traveling spatially localized convective structures in an inclined porous medium
• Natural convection in a vertical channel. Part 3. Bifurcations of many (additional) unstable periodic orbits and their dynamical relevance