Bifurcation analysis of two-dimensional Rayleigh-Bénard convection using deflation
| Autor: | N. Boullé, V. Dallas, P. E. Farrell |
|---|---|
| Přispěvatelé: | Apollo - University of Cambridge Repository |
| Rok vydání: | 2022 |
| Předmět: |
Physics::Fluid Dynamics
4012 Fluid Mechanics and Thermal Engineering Fluid Dynamics (physics.flu-dyn) FOS: Mathematics FOS: Physical sciences Numerical Analysis (math.NA) Physics - Fluid Dynamics Mathematics - Numerical Analysis Computational Physics (physics.comp-ph) Physics - Computational Physics 40 Engineering |
| Zdroj: | Physical Review E. 105 |
| ISSN: | 2470-0053 2470-0045 |
| DOI: | 10.1103/physreve.105.055106 |
| Popis: | We perform a bifurcation analysis of the steady states of Rayleigh--B\'enard convection with no-slip boundary conditions in two dimensions using a numerical method called deflated continuation. By combining this method with an initialisation strategy based on the eigenmodes of the conducting state, we are able to discover multiple solutions to this non-linear problem, including disconnected branches of the bifurcation diagram, without the need for any prior knowledge of the solutions. One of the disconnected branches we find contains an S-shaped curve with hysteresis, which is the origin of a flow pattern that may be related to the dynamics of flow reversals in the turbulent regime. Linear stability analysis is also performed to analyse the steady and unsteady regimes of the solutions in the parameter space and to characterise the type of instabilities. Comment: 19 pages, 16 figures |
| Databáze: | OpenAIRE |
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