Flow reversals in turbulent convection via vortex reconnections

We employ detailed numerical simulations to probe the mechanism of flow reversals in two-dimensional turbulent convection. We show that the reversals occur via a vortex reconnection of two attracting corner rolls having the same sign of vorticity, thus leading to major restructuring of the flow. Lar...

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Bibliographic Details
Published in:Physical review letters 2013-03, Vol.110 (11), p.114503-114503, Article 114503
Main Authors: Chandra, Mani, Verma, Mahendra K
Format: Article
Language:English
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Summary:We employ detailed numerical simulations to probe the mechanism of flow reversals in two-dimensional turbulent convection. We show that the reversals occur via a vortex reconnection of two attracting corner rolls having the same sign of vorticity, thus leading to major restructuring of the flow. Large fluctuations in heat transport are observed during the reversal due to the flow reconfiguration. The flow configurations during the reversals have been analyzed quantitatively using large-scale modes. Using these tools, we also show why flow reversals occur for a restricted range of Rayleigh and Prandtl numbers.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.110.114503