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

doi:10.1016/j.icheatmasstransfer.2019.104319

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 language	English
Article number	104319
Journal	International Communications in Heat and Mass Transfer
Volume	108
Early online date	12 Sep 2019
DOIs	https://doi.org/10.1016/j.icheatmasstransfer.2019.104319
Publication status	Published - Nov 2019
Externally published	Yes

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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10.1016/j.icheatmasstransfer.2019.104319

Post-PrintAccepted author manuscript, 4.73 MBLicence: CC BY-NC-ND

Cite this

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title = "Transient flows and reorientations of large-scale convection in a cubic cell",

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. ",

keywords = "Turbulent convection, Large-scale circulation, OpenFoam, LES",

author = "Andrei Vasiliev and Peter Frick and Abhishek Kumar and Rodion Stepanov and Andrei Sukhanovskii and Verma, {Mahendra K.}",

note = "NOTICE: this is the author{\textquoteright}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 {\textcopyright} 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ ",

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language = "English",

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journal = "International Communications in Heat and Mass Transfer",

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T1 - Transient flows and reorientations of large-scale convection in a cubic cell

AU - Vasiliev, Andrei

AU - Frick, Peter

AU - Kumar, Abhishek

AU - Stepanov, Rodion

AU - Sukhanovskii, Andrei

AU - Verma, Mahendra K.

N1 - 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/

PY - 2019/11

Y1 - 2019/11

N2 - 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.

AB - 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.

KW - Turbulent convection

KW - Large-scale circulation

KW - OpenFoam

KW - LES

U2 - 10.1016/j.icheatmasstransfer.2019.104319

DO - 10.1016/j.icheatmasstransfer.2019.104319

M3 - Article

VL - 108

JO - International Communications in Heat and Mass Transfer

JF - International Communications in Heat and Mass Transfer

SN - 0735-1933

M1 - 104319

ER -

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

Abstract

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Keywords

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