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On the non-parallel instability of the rotating-sphere boundary layer
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-8667-0520
2017 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 818, p. 288-318Article in journal (Refereed) Published
Abstract [en]

We present a new solution for the steady boundary-layer flow over the rotating sphere that also accounts for the eruption of the boundary layer at the equator and other higher-order viscous effects. Non-parallel corrections to the local type I and type II convective instability modes of this flow are also computed as a function of spin rate. Our instability results are associated with the previously observed spiral vortices and remarkable agreement between our predictions of the number of vortices and experimental observations is found. Vortices travelling at 70 %-80 % of the local surface speed are found to be the most amplified for sufficient spin rates, also consistent with prior experimental observations.

Place, publisher, year, edition, pages
CAMBRIDGE UNIV PRESS , 2017. Vol. 818, p. 288-318
Keywords [en]
absolute/convective instability, boundary layer stability
National Category
Fusion, Plasma and Space Physics Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-206240DOI: 10.1017/jfm.2017.131ISI: 000398508300017Scopus ID: 2-s2.0-85016389202OAI: oai:DiVA.org:kth-206240DiVA, id: diva2:1096127
Note

QC 20170517

Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-19Bibliographically approved

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Segalini, Antonio

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