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  The effect of Prandtl number on turbulent sheared thermal convection

Blass, A., Tabak, P., Verzicco, R., Stevens, R. J., & Lohse, D. (2021). The effect of Prandtl number on turbulent sheared thermal convection. Journal of Fluid Mechanics, 910: A37. doi:10.1017/jfm.2020.1019.

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 Creators:
Blass, Alexander, Author
Tabak, Pier, Author
Verzicco, Roberto, Author
Stevens, Richard J.A.M., Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: In turbulent wall sheared thermal convection, there are three different flow regimes, depending on the relative relevance of thermal forcing and wall shear. In this paper, we report the results of direct numerical simulations of such sheared Rayleigh–Bénard convection, at fixed Rayleigh number Ra = 10^6, varying the wall Reynolds number in the range 0 <= Rew <= 4000 and Prandtl number 0.22 <= Pr <= 4.6, extending our prior work by Blass et al. (J. Fluid Mech., vol. 897, 2020, A22), where Pr was kept constant at unity and the thermal forcing (Ra) varied. We cover a wide span of bulk Richardson numbers 0.014 <= Ri <= 100 and show that the Prandtl number strongly influences the morphology and dynamics of the flow structures. In particular, at fixed Ra and Rew, a high Prandtl number causes stronger momentum transport from the walls and therefore yields a greater impact of the wall shear on the flow structures, resulting in an increased effect of Rew on the Nusselt number. Furthermore, we analyse the thermal and kinetic boundary layer thicknesses and relate their behaviour to the resulting flow regimes. For the largest shear rates and Pr numbers, we observe the emergence of a Prandtl–von Kármán log layer, signalling the onset of turbulent dynamics in the boundary layer.

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Language(s): eng - English
 Dates: 2021-01-152021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1017/jfm.2020.1019
 Degree: -

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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Publ. Info: -
Pages: 14 Volume / Issue: 910 Sequence Number: A37 Start / End Page: - Identifier: ISSN: 0022-1120
ISSN: 1469-7645