| Issue |
EPL
Volume 134, Number 3, May 2021
|
|
|---|---|---|
| Article Number | 34004 | |
| Number of page(s) | 7 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/134/34004 | |
| Published online | 14 July 2021 | |
Connecting boundary layer dynamics with extreme bulk dissipation events in Rayleigh-Bénard flow(a)
1 Institut für Thermo- und Fluiddynamik, Technische Universität Ilmenau - D-98684 Ilmenau, Germany
2 Tandon School of Engineering, New York University - New York City, NY 11201, USA
(b) valentina.valori@tu-ilmenau.de (corresponding author)
Received: 26 March 2021
Accepted: 17 May 2021
We study the connection between extreme events of thermal and kinetic energy dissipation rates in the bulk of three-dimensional Rayleigh-Bénard convection and the wall shear stress patterns at the top and the bottom plates that enclose the layer. Zero points of this two-dimensional vector field stand for detachments of strong thermal plumes. If their position at the opposite plates and a given time is close then they can be considered as precursors for high-amplitude bulk dissipation events triggered by plume collisions or close passings. This scenario requires a breaking of the synchronicity of the boundary layer dynamics at both plates which is found to be in line with a transition of the bulk derivative statistics from Gaussian to intermittent. Our studies are based on three-dimensional high-resolution direct numerical simulations for moderate Rayleigh numbers between 
and 
.
© 2021 EPLA
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