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Mean flow generation due to longitudinal librations of sidewalls of a rotating annulus

  • Laboratory experiments with a rotating cylindrical annulus arereported that reveal a prograde jet, which is adjacent to a (longitu-dinally) librating inner straight cylindrical wall. Here, wall libration isrealised as a time-harmonic modulation of the inner cylinder’s rota-tion rate. The outer cylindrical wall and bottom and top lids rotatewith constant angular velocity. The main purpose of our study is tocontribute to a qualitative and quantitative understanding of non-linearities that are present in oscillating, but centrifugally stable,vertical boundary layers frequently encountered in rotating wall-bounded flows. We consider a problem that is in a sense comple-mentary to that of previous works that focused on oscillating Ekmanlayers but neglected the vertical Stokes−Stewartson layers. A sim-ple analytical model is proposed that is able to predict the magni-tude and spatial structure of the emerging prograde near-wall jet interms of nonlinearity inherent in the inner cylinder’s boundary layerdynamics.

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Metadaten
Author: Michael V. KurganskyORCiD, Torsten Seelig, Marten KleinORCiD, Andreas Will, Uwe HarlanderORCiD
DOI:https://doi.org/10.1080/03091929.2019.1692829
ISSN:1029-0419
Title of the source (English):Geophysical & Astrophysical Fluid Dynamics
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2020
Tag:boundary layer structure; geophysical and geological flows; longitudinal libration
Volume/Year:114
Issue number:6
Number of pages:742
First Page:762
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Atmosphärische Prozesse
Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Aerodynamik und Strömungslehre
Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Numerische Strömungs- und Gasdynamik
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