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Zero absolute vorticity: Insight from experiments in rotating laminar plane Couette flow

Suryadi, Alexandre and Segalini, Antonio and Alfredsson, P. Henrik (2014) Zero absolute vorticity: Insight from experiments in rotating laminar plane Couette flow. Physical Review E, 89 (3), pp. 1-8. American Physical Society. ISSN 2470-0045.

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Official URL: http://dx.doi.org/10.1103/PhysRevE.89.033003


For pressure-driven turbulent channel flows undergoing spanwise system rotation, it has been observed that the absolute vorticity, i.e., the sum of the averaged spanwise flow vorticity and system rotation, tends to zero in the central region of the channel. This observation has so far eluded a convincing theoretical explanation, despite experimental and numerical evidence reported in the literature. Here we show experimentally that three-dimensional laminar structures in plane Couette flow, which appear under anticyclonic system rotation, give the same effect, namely, that the absolute vorticity tends to zero if the rotation rate is high enough. It is shown that this is equivalent to a local Richardson number of approximately zero, which would indicate a stable condition. We also offer an explanation based on Kelvin’s circulation theorem to demonstrate that the absolute vorticity should remain constant and approximately equal to zero in the central region of the channel when going from the nonrotating fully turbulent state to any state with sufficiently high rotation.

Item URL in elib:https://elib.dlr.de/91403/
Document Type:Article
Additional Information:Paper: 033003
Title:Zero absolute vorticity: Insight from experiments in rotating laminar plane Couette flow
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Suryadi, Alexandre[Alexandre.Suryadi (at) dlr.de]UNSPECIFIED
Segalini, Antonio[segalini (at) mech.kth.se]UNSPECIFIED
Alfredsson, P. Henrik[phal (at) mech.kth.se]UNSPECIFIED
Date:5 March 2014
Journal or Publication Title:Physical Review E
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-8
Publisher:American Physical Society
Keywords:shear flow, nonlinear instability, particle image velocimetry,
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:other
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Wind Energy (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Suryadi, Alexandre
Deposited On:26 Nov 2014 08:40
Last Modified:17 Mar 2021 13:40

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