Dynamics of defects in Rayleigh-Bénard convection
- 1 August 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 24 (2), 1036-1049
- https://doi.org/10.1103/physreva.24.1036
Abstract
The behavior of an extra roll extending into an otherwise regular convection pattern is studied as a function of Rayleigh number, Prandtl number, , and wavelength, by means of a fully resolved numerical simulation of the Boussinesq equations with free-slip boundary conditions. For reduced Rayleigh numbers of order one or less and , numerical simulations of the lowest-order amplitude equations reproduce the Boussinesq results semiquantitatively. In particular, we find that when this class of defects is stable, they move with constant velocity , parallel to the roll axis and give rise to a slow modulation of the roll pattern of the form . Both and have been calculated analytically within a linearized theory. The envelope function depends in an essential way on such that the limit cannot be sensibly taken.
Keywords
This publication has 19 references indexed in Scilit:
- Forced Phase Diffusion in Rayleigh-Bénard ConvectionPhysical Review Letters, 1980
- Turbulence near Onset of ConvectionPhysical Review Letters, 1980
- Vortex Waves: Stationary "States," Interactions, Recurrence, and BreakingPhysical Review Letters, 1978
- Critical effects in Rayleigh-Benard convectionJournal de Physique, 1978
- The propagation of dislocations in Rayleigh-Bénard rolls and bimodal flowJournal of Fluid Mechanics, 1976
- Transition to time-dependent convectionJournal of Fluid Mechanics, 1974
- The oscillatory instability of convection rolls in a low Prandtl number fluidJournal of Fluid Mechanics, 1972
- Distant side-walls cause slow amplitude modulation of cellular convectionJournal of Fluid Mechanics, 1969
- Evolution of two-dimensional periodic Rayleigh convection cells of arbitrary wave-numbersJournal of Fluid Mechanics, 1968
- On the stability of steady finite amplitude convectionJournal of Fluid Mechanics, 1965