Off-centre gravity induces large-scale flow patterns in spherical Rayleigh–Bénard convection

Guiquan Wang; Luca Santelli; Roberto Verzicco; Detlef Lohse; Richard J.A.M. Stevens

doi:10.1017/jfm.2022.360

Off-centre gravity induces large-scale flow patterns in spherical Rayleigh–Bénard convection

Guiquan Wang^*
, Luca Santelli
, Roberto Verzicco
, Detlef Lohse
, Richard J.A.M. Stevens

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

3 Citations (Scopus)

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Abstract

We perform direct numerical simulations to study the effect of the gravity centre offset in spherical Rayleigh-Bénard convection. When the gravity centre is shifted towards the south, we find that the shift of the gravity centre has a pronounced influence on the flow structures. At low Rayleigh number Formula Presented, a steady-state large-scale meridional circulation induced by the baroclinic imbalance, created by the misalignment of the gravity potentials and isotherms, is formed. At high Formula Presented, an energetic jet is created on the northern side of the inner sphere that is directed towards the outer sphere. The large-scale circulation induces a strong co-latitudinal dependence in the local heat flux. Nevertheless, the global heat flux is not affected by the changes in the large-scale flow organization induced by the gravity centre offset.

Original language	English
Article number	A21
Journal	Journal of fluid mechanics
Volume	942
Early online date	19 May 2022
DOIs	https://doi.org/10.1017/jfm.2022.360
Publication status	Published - 10 Jul 2022

Keywords

Convection
fluid mechanics
fluid dynamics
turbulence
direct numerical simulations
heat transfer
high performance computing
UT-Hybrid-D

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10.1017/jfm.2022.360Licence: CC BY

Wang-2022-Off-centre-gravity-induces-large-scFinal published version, 2.73 MBLicence: CC BY

Cite this

@article{27bb66de5c624c9b81fad871be3d3630,

title = "Off-centre gravity induces large-scale flow patterns in spherical Rayleigh{\textendash}B{\'e}nard convection",

abstract = "We perform direct numerical simulations to study the effect of the gravity centre offset in spherical Rayleigh-B{\'e}nard convection. When the gravity centre is shifted towards the south, we find that the shift of the gravity centre has a pronounced influence on the flow structures. At low Rayleigh number Formula Presented, a steady-state large-scale meridional circulation induced by the baroclinic imbalance, created by the misalignment of the gravity potentials and isotherms, is formed. At high Formula Presented, an energetic jet is created on the northern side of the inner sphere that is directed towards the outer sphere. The large-scale circulation induces a strong co-latitudinal dependence in the local heat flux. Nevertheless, the global heat flux is not affected by the changes in the large-scale flow organization induced by the gravity centre offset.",

keywords = "Convection, fluid mechanics, fluid dynamics, turbulence, direct numerical simulations, heat transfer, high performance computing, UT-Hybrid-D",

author = "Guiquan Wang and Luca Santelli and Roberto Verzicco and Detlef Lohse and Stevens, \{Richard J.A.M.\}",

note = "Funding Information: G.W. and R.J.A.M.S. acknowledge financial support from ERC (the European Research Council) Starting grant no. 804283 UltimateRB. This work was sponsored by NWO Science for the use of supercomputer facilities. Funding Information: The authors thank the three anonymous referees for constructive comments that improved the paper. We also acknowledge the Irene at Tr{\`e}s Grand Centre de Calcul du CEA (TGCC) under PRACE project 2019215098, and the national e-infrastructure of SURFsara, a subsidiary of SURF cooperation, the collaborative ICT organization for Dutch education and research. We acknowledge PRACE for awarding us access to MareNostrum at Barcelona Supercomputing Center (BSC), Spain (projects 2020225335 and 2020235589). Publisher Copyright: {\textcopyright} The Author(s), 2022. Published by Cambridge University Press",

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doi = "10.1017/jfm.2022.360",

language = "English",

volume = "942",

journal = "Journal of fluid mechanics",

issn = "0022-1120",

publisher = "Cambridge University Press",

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T1 - Off-centre gravity induces large-scale flow patterns in spherical Rayleigh–Bénard convection

AU - Wang, Guiquan

AU - Santelli, Luca

AU - Verzicco, Roberto

AU - Lohse, Detlef

AU - Stevens, Richard J.A.M.

N1 - Funding Information: G.W. and R.J.A.M.S. acknowledge financial support from ERC (the European Research Council) Starting grant no. 804283 UltimateRB. This work was sponsored by NWO Science for the use of supercomputer facilities. Funding Information: The authors thank the three anonymous referees for constructive comments that improved the paper. We also acknowledge the Irene at Très Grand Centre de Calcul du CEA (TGCC) under PRACE project 2019215098, and the national e-infrastructure of SURFsara, a subsidiary of SURF cooperation, the collaborative ICT organization for Dutch education and research. We acknowledge PRACE for awarding us access to MareNostrum at Barcelona Supercomputing Center (BSC), Spain (projects 2020225335 and 2020235589). Publisher Copyright: © The Author(s), 2022. Published by Cambridge University Press

PY - 2022/7/10

Y1 - 2022/7/10

N2 - We perform direct numerical simulations to study the effect of the gravity centre offset in spherical Rayleigh-Bénard convection. When the gravity centre is shifted towards the south, we find that the shift of the gravity centre has a pronounced influence on the flow structures. At low Rayleigh number Formula Presented, a steady-state large-scale meridional circulation induced by the baroclinic imbalance, created by the misalignment of the gravity potentials and isotherms, is formed. At high Formula Presented, an energetic jet is created on the northern side of the inner sphere that is directed towards the outer sphere. The large-scale circulation induces a strong co-latitudinal dependence in the local heat flux. Nevertheless, the global heat flux is not affected by the changes in the large-scale flow organization induced by the gravity centre offset.

AB - We perform direct numerical simulations to study the effect of the gravity centre offset in spherical Rayleigh-Bénard convection. When the gravity centre is shifted towards the south, we find that the shift of the gravity centre has a pronounced influence on the flow structures. At low Rayleigh number Formula Presented, a steady-state large-scale meridional circulation induced by the baroclinic imbalance, created by the misalignment of the gravity potentials and isotherms, is formed. At high Formula Presented, an energetic jet is created on the northern side of the inner sphere that is directed towards the outer sphere. The large-scale circulation induces a strong co-latitudinal dependence in the local heat flux. Nevertheless, the global heat flux is not affected by the changes in the large-scale flow organization induced by the gravity centre offset.

KW - Convection

KW - fluid mechanics

KW - fluid dynamics

KW - turbulence

KW - direct numerical simulations

KW - heat transfer

KW - high performance computing

KW - UT-Hybrid-D

U2 - 10.1017/jfm.2022.360

DO - 10.1017/jfm.2022.360

M3 - Article

SN - 0022-1120

VL - 942

JO - Journal of fluid mechanics

JF - Journal of fluid mechanics

M1 - A21

ER -

Off-centre gravity induces large-scale flow patterns in spherical Rayleigh–Bénard convection

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