Transient flows and reorientations of large-scale convection in a cubic cell

Andrei Vasiliev, Peter Frick, Abhishek Kumar, Rodion Stepanov, Andrei Sukhanovskii, Mahendra K. Verma

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Abstract

The transient processes of a turbulent large-scale convective circulation (LSC) in a cubic cell are investigated using large-eddy simulations for Rayleigh number $Ra=10^8$ and Prandtl number $Pr=0.7$. For the first time, we have explicitly shown that LSC is accompanied by large-scale azimuthal flows with non-zero total angular momentum. It is also shown that solid-body rotation of the entire fluid is not realized. It is found that correlation between rotation of LSC plane and the mean azimuthal motion is high during quasiperiodic oscillations of LSC near the diagonal plane and relatively weak during LSC reorientations. We propose a new plausible scenario for the reorientations of the LSC in a cube that does not involve a mean azimuthal flow. Instead of a single-roll, we introduce the superposition of a pair of large-scale orthogonal quasi-two-dimensional (Q2D) rolls and the reorientation of the LSC occurs as a result of the cessation of one of the Q2D rolls. This scenario is consistent with all known experimental and numerical data.
Original languageEnglish
Article number104319
JournalInternational Communications in Heat and Mass Transfer
Volume108
Early online date12 Sep 2019
DOIs
Publication statusPublished - Nov 2019
Externally publishedYes

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in International Communications in Heat and Mass Transfer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Communications in Heat and Mass Transfer, 108, (2019)
DOI: 10.1016/j.icheatmasstransfer.2019.104319

© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Turbulent convection
  • Large-scale circulation
  • OpenFoam
  • LES

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