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  Boundary layers in turbulent vertical convection at high Prandtl number

Howland, C. J., Ng, C. S., Verzicco, R., & Lohse, D. (2022). Boundary layers in turbulent vertical convection at high Prandtl number. Journal of Fluid Mechanics, 930: A32. doi:10.1017/jfm.2021.952.

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 Creators:
Howland, Christopher J., Author
Ng, Chong Shen, Author
Verzicco, Roberto, Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: Many environmental flows arise due to natural convection at a vertical surface, from flows in buildings to dissolving ice faces at marine-terminating glaciers. We use three-dimensional direct numerical simulations of a vertical channel with differentially heated walls to investigate such convective, turbulent boundary layers. Through the implementation of a multiple-resolution technique, we are able to perform simulations at a wide range of Prandtl numbers Pr. This allows us to distinguish the parameter dependences of the horizontal heat flux and the boundary layer widths in terms of the Rayleigh number Ra and Prandtl number Pr. For the considered parameter range 1 ≤ Pr ≤ 100, 106 ≤ Ra ≤ 109, we find the flow to be consistent with a ‘buoyancy-controlled’ regime where the heat flux is independent of the wall separation. For given Pr, the heat flux is found to scale linearly with the friction velocity V∗. Finally, we discuss the implications of our results for the parameterisation of heat and salt fluxes at vertical ice–ocean interfaces.

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Language(s): eng - English
 Dates: 2021-11-162022
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1017/jfm.2021.952
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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Publ. Info: -
Pages: 17 Volume / Issue: 930 Sequence Number: A32 Start / End Page: - Identifier: ISSN: 0022-1120
ISSN: 1469-7645