Volume 134, Number 3, May 2021
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|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
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 .
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