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- W4367055387 abstract "We investigate how the heat flux $Nu$ scales with the imposed temperature gradient $Ra$ in homogeneous Rayleigh–Bénard convection using one-, two- and three-dimensional simulations on logarithmic lattices. Logarithmic lattices are a new spectral decimation framework which enables us to span an unprecedented range of parameters ( $Ra$ , $Re$ , $Pr$ ) and test existing theories using little computational power. We first show that known diverging solutions can be suppressed with a large-scale friction. In the turbulent regime, for $Pr approx 1$ , the heat flux becomes independent of viscous processes (‘asymptotic ultimate regime’, $Nusim Ra ^{1/2}$ with no logarithmic correction). We recover scalings coherent with the theory developed by Grossmann and Lohse, for all situations where the large-scale frictions keep a constant magnitude with respect to viscous and diffusive dissipation. We also identify another turbulent friction-dominated regime at $Pr ll 1$ , where deviations from the Grossmann and Lohse prediction are observed. These two friction-dominated regimes may be relevant in some geophysical or astrophysical situations, where large-scale friction arises due to rotation, stratification or magnetic field." @default.
- W4367055387 created "2023-04-27" @default.
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- W4367055387 date "2023-04-26" @default.
- W4367055387 modified "2023-09-30" @default.
- W4367055387 title "Asymptotic ultimate regime of homogeneous Rayleigh–Bénard convection on logarithmic lattices" @default.
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- W4367055387 doi "https://doi.org/10.1017/jfm.2023.204" @default.
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