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Journal Article

Diffusion‐Free Scaling in Rotating Spherical Rayleigh‐Bénard Convection


Lohse,  Detlef
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Wang, G., Santelli, L., Lohse, D., Verzicco, R., & Stevens, R. J. A. M. (2021). Diffusion‐Free Scaling in Rotating Spherical Rayleigh‐Bénard Convection. Geophysical Research Letters, 48: e2021GL095017. doi:10.1029/2021GL095017.

Cite as: https://hdl.handle.net/21.11116/0000-0009-F6C4-4
Direct numerical simulations are employed to reveal three distinctly different flow regions in rotating spherical Rayleigh-Bénard convection. In the high-latitude region vertical (parallel to the axis of rotation) convective columns are generated between the hot inner and the cold outer sphere. The mid-latitude region II is dominated by vertically aligned convective columns formed between the Northern and Southern hemispheres of the outer sphere. The diffusion-free scaling, which indicates bulk-dominated convection, originates from this mid-latitude region. In the equator region III, the vortices are affected by the outer spherical boundary and are much shorter than in region II.