English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Boundary zonal flows in rapidly rotating turbulent thermal convection

Zhang, X., Ecke, R. E., & Shishkina, O. (2021). Boundary zonal flows in rapidly rotating turbulent thermal convection. Journal of Fluid Mechanics, 915: A62. doi:10.1017/jfm.2021.74.

Item is

Files

show Files
hide Files
:
boundary-zonal-flows-in-rapidly-rotating-turbulent-thermal-convection.pdf (Publisher version), 2MB
Name:
boundary-zonal-flows-in-rapidly-rotating-turbulent-thermal-convection.pdf
Description:
17 March 2021
OA-Status:
Hybrid
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-

Locators

show

Creators

show
hide
 Creators:
Zhang, Xuan1, Author           
Ecke, Robert E., Author
Shishkina, Olga1, Author           
Affiliations:
1Laboratory for Fluid Physics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063287              

Content

show
hide
Free keywords: -
 Abstract: Recently, in Zhang et al. (Phys. Rev. Lett., vol. 124, 2020, 084505), it was found that, in rapidly rotating turbulent Rayleigh–Bénard convection in slender cylindrical containers (with diameter-to-height aspect ratio Γ=1/2) filled with a small-Prandtl-number fluid (Pr≈0.8), the large-scale circulation is suppressed and a boundary zonal flow (BZF) develops near the sidewall, characterized by a bimodal probability density function of the temperature, cyclonic fluid motion and anticyclonic drift of the flow pattern (with respect to the rotating frame). This BZF carries a disproportionate amount (>60%) of the total heat transport for Pr<1, but decreases rather abruptly for larger Pr to approximately 35%. In this work, we show that the BZF is robust and appears in rapidly rotating turbulent Rayleigh–Bénard convection in containers of different Γ and over a broad range of Pr and Ra. Direct numerical simulations for Prandtl number 0.1≤Pr≤12.3, Rayleigh number 107≤Ra≤5×109, inverse Ekman number 105≤1/Ek≤107 and Γ=1/3, 1/2, 3/4, 1 and 2 show that the BZF width δ0 scales with the Rayleigh number Ra and Ekman number Ek as δ0/H∼Γ0Pr{−1/4,0}Ra1/4Ek2/3 ({Pr<1,Pr>1}) and with the drift frequency scales as ω/Ω∼Γ0Pr−4/3RaEk5/3, where H is the cell height and Ω the angular rotation rate. The mode number of the BZF is 1 for Γ≲1 and 2Γ for Γ={1,2} independent of Ra and Pr. The BZF is quite reminiscent of wall mode states in rotating convection.

Details

show
hide
Language(s): eng - English
 Dates: 2021-03-172021-05-25
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1017/jfm.2021.74
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Fluid Mechanics
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Cambridge : Cambridge University Press
Pages: 21 Volume / Issue: 915 Sequence Number: A62 Start / End Page: - Identifier: ISSN: 0022-1120
CoNE: https://pure.mpg.de/cone/journals/resource/954925340716