Janet D. Scheel
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View article: No sustained mean velocity in the boundary region of plane thermal convection
No sustained mean velocity in the boundary region of plane thermal convection Open
We study the dynamics of thermal and momentum boundary regions in three-dimensional direct numerical simulations of Rayleigh–Bénard convection for the Rayleigh-number range $10^5\leq Ra \leq 10^{11}$ and $Pr=0.7$ . Using a Cartesian slab w…
View article: No sustained mean velocity in the boundary region of plane thermal convection
No sustained mean velocity in the boundary region of plane thermal convection Open
We study the dynamics of thermal and momentum boundary regions in three-dimensional direct numerical simulations of Rayleigh-Bénard convection for the Rayleigh number range $10^5 \le Ra \le 10^{11}$ and $Pr=0.7$. Using a Cartesian slab wit…
View article: Inverse cascades of kinetic energy and thermal variance in three-dimensional horizontally extended turbulent convection
Inverse cascades of kinetic energy and thermal variance in three-dimensional horizontally extended turbulent convection Open
Inverse cascades of kinetic energy and thermal variance in the subset of vertically homogeneous modes in spectral space are found to cause a slow aggregation to a pair of convective supergranules that eventually fill the whole horizontally…
View article: Inverse cascades of kinetic energy and thermal variance in three-dimensional horizontally extended turbulent convection
Inverse cascades of kinetic energy and thermal variance in three-dimensional horizontally extended turbulent convection Open
Inverse cascades of kinetic energy and thermal variance in the subset of vertically homogeneous modes in spectral space are found to cause a slow aggregation to a pair of convective supergranules that eventually fill the whole horizontally…
View article: Supergranule aggregation for constant heat flux-driven turbulent convection
Supergranule aggregation for constant heat flux-driven turbulent convection Open
Turbulent convection processes in nature are often found to be organized in a\nhierarchy of plume structures and flow patterns. The gradual aggregation of\nconvection cells or granules to a supergranule which eventually fills the whole\nho…
View article: Reply to He et al.: The dependence of heat transport law on aspect ratio is still unclear
Reply to He et al.: The dependence of heat transport law on aspect ratio is still unclear Open
YouTube's algorithm is often accused of putting users in filter bubbles and generating rabbit holes of radicalization. However, evidence on these issues is inconclusive. We conduct a systematic audit of the platform using 100,000 sock pupp…
View article: Classical 1/3 scaling of convection holds up to Ra = 10 <sup>15</sup>
Classical 1/3 scaling of convection holds up to Ra = 10 <sup>15</sup> Open
Significance The heat transport law in turbulent convection remains central to current research in the field. Our present knowledge of the heat transport law for is inconclusive, where the Rayleigh number is a measure of the s…
View article: Video: Turbulent Convection in Liquid Sodium
Video: Turbulent Convection in Liquid Sodium Open
View article: Eulerian and Lagrangian perspectives on turbulent superstructures in Rayleigh-Bénard convection
Eulerian and Lagrangian perspectives on turbulent superstructures in Rayleigh-Bénard convection Open
Large-scale computations in combination with new mathematical analysis tools make studies of the large-scale patterns, which are termed turbulent superstructures, in extended turbulent convection flows now accessible. Here, we report recen…
View article: Predicting transition ranges to fully turbulent viscous boundary layers in low Prandtl number convection flows
Predicting transition ranges to fully turbulent viscous boundary layers in low Prandtl number convection flows Open
Characteristic properties of turbulent Rayleigh-B\'enard convection in the bulk and the boundary layers are summarized for a wide range of Rayleigh and Prandtl numbers, with a specific emphasis on low-Prandtl-number convection.
View article: Predicting transition ranges to turbulent viscous boundary layers in low Prandtl number convection flows
Predicting transition ranges to turbulent viscous boundary layers in low Prandtl number convection flows Open
We discuss two aspects of turbulent Rayleigh-Bénard convection (RBC) on the basis of high-resolution direct numerical simulations in a unique setting; a closed cylindrical cell of aspect ratio of one. First, we present a comprehensive comp…
View article: Predicting transition ranges to turbulent viscous boundary layers in low\n Prandtl number convection flows
Predicting transition ranges to turbulent viscous boundary layers in low\n Prandtl number convection flows Open
We discuss two aspects of turbulent Rayleigh-B\\'{e}nard convection (RBC) on\nthe basis of high-resolution direct numerical simulations in a unique setting;\na closed cylindrical cell of aspect ratio of one. First, we present a\ncomprehens…
View article: Transitional boundary layers in low-Prandtl-number convection
Transitional boundary layers in low-Prandtl-number convection Open
The boundary layer structure of the velocity and temperature fields in\nturbulent Rayleigh-Benard flows in closed cylindrical cells of unit aspect\nratio is revisited from a transitional and turbulent viscous boundary layer\nperspective. W…
View article: Extreme dissipation event due to plume collision in a turbulent convection cell
Extreme dissipation event due to plume collision in a turbulent convection cell Open
An extreme dissipation event in the bulk of a closed three-dimensional turbulent convection cell is found to be correlated with a strong reduction of the large-scale circulation flow in the system that happens at the same time as a plume e…
View article: Global and local statistics in turbulent convection at low Prandtl numbers
Global and local statistics in turbulent convection at low Prandtl numbers Open
Statistical properties of turbulent Rayleigh–Bénard convection at low Prandtl numbers $Pr$ , which are typical for liquid metals such as mercury or gallium ( $Pr\simeq 0.021$ ) or liquid sodium ( $Pr\simeq 0.005$ ), are investigated in hig…
View article: Global and local statistics in turbulent convection at low Prandtl numbers
Global and local statistics in turbulent convection at low Prandtl numbers Open
Statistical properties of turbulent Rayleigh-Benard convection at low Prandtl numbers (Pr), which are typical for liquid metals such as mercury, gallium or liquid sodium, are investigated in high-resolution three-dimensional spectral eleme…
View article: Enhanced enstrophy generation for turbulent convection in low-Prandtl-number fluids
Enhanced enstrophy generation for turbulent convection in low-Prandtl-number fluids Open
Significance Low-Prandtl-number thermal convection flows in liquid metals for which the temperature diffusivity is much larger than the fluid viscosity have been studied much less frequently than convective flows in air or water, despite m…