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Oscillating large-scale circulation in turbulent Rayleigh-Bénard convection
Phys. Rev. E 73, 056304 – Published 10 May, 2006
DOI: https://doi.org/10.1103/PhysRevE.73.056304
Abstract
We report on the dynamics and structure of the turbulent velocity field in a high-Rayleigh-number thermal convection cell with an aspect ratio of 4. Spectral density functions (measured with laser Doppler velocimetry) indicated the existence of a large-scale periodic component. The long-time mean flow field (measured with particle image velocimetry) revealed that the large-scale circulation in the aspect-ratio-4 cell consists of two corotating rolls. The periodicity in the flow could be traced back to the alternating growth and decay of these rolls.
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