We simulate three-dimensional, horizontally periodic Rayleigh-Benard convection, confined between free-slip horizontal plates and rotating about a distant horizontal axis. When both the temperature difference between the plates and the rotation rate are sufficiently large, a strong horizontal wind is generated that is perpendicular to both the rotation vector and the gravity vector. The wind is turbulent, large-scale, and vertically sheared. Horizontal anisotropy, engendered here by rotation, appears necessary for such wind generation. Most of the kinetic energy of the flow resides in the wind, and the vertical turbulent heat flux is much lower on average than when there is no wind.

Generation of Large-Scale Winds in Horizontally Anisotropic Convection / von Hardenberg, J.; Goluskin, D.; Provenzale, A.; Spiegel, E. A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 115:13(2015). [10.1103/PhysRevLett.115.134501]

Generation of Large-Scale Winds in Horizontally Anisotropic Convection

von Hardenberg, J.;
2015

Abstract

We simulate three-dimensional, horizontally periodic Rayleigh-Benard convection, confined between free-slip horizontal plates and rotating about a distant horizontal axis. When both the temperature difference between the plates and the rotation rate are sufficiently large, a strong horizontal wind is generated that is perpendicular to both the rotation vector and the gravity vector. The wind is turbulent, large-scale, and vertically sheared. Horizontal anisotropy, engendered here by rotation, appears necessary for such wind generation. Most of the kinetic energy of the flow resides in the wind, and the vertical turbulent heat flux is much lower on average than when there is no wind.
File in questo prodotto:
File Dimensione Formato  
2015GnerationPhysRevLett.115.134501.pdf

accesso aperto

Tipologia: 2a Post-print versione editoriale / Version of Record
Licenza: PUBBLICO - Tutti i diritti riservati
Dimensione 814.65 kB
Formato Adobe PDF
814.65 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2815052