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• W3039332835 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-B'enard convection, at fixed Rayleigh number $Ra=10^6$, varying the wall Reynolds number in the range $0 leq Re_w leq 4000$ and Prandtl number $0.22 leq Pr leq 4.6$, extending our prior work by Blass et al. (2020), where $Pr$ was kept constant at unity and the thermal forcing ($Ra$) varied. We cover a wide span of bulk Richardson numbers $0.014 leq Ri leq 100$ and show that the Prandtl number strongly influences the morphology and dynamics of the flow structures. In particular, at fixed $Ra$ and $Re_w$, 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 $Re_w$ 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 Karman log-layer, signalling the onset of turbulent dynamics in the boundary layer. Finally, our results allow to extend the Grossmann-Lohse theory for heat transport in Rayleigh-B'enard convection to the sheared case, universally describing $Nu(Ra,Pr,Re_w)$." @default.
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• W3039332835 date "2021-01-15" @default.
• W3039332835 modified "2023-10-09" @default.
• W3039332835 title "The effect of Prandtl number on turbulent sheared thermal convection" @default.
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• W3039332835 doi "https://doi.org/10.1017/jfm.2020.1019" @default.
• W3039332835 hasPublicationYear "2021" @default.
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