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Investigation of the structures in the unstable rotating-cone boundary layer
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-5532-2379
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1146-3241
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-0516-2706
2019 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 4, no 5, article id 053903Article in journal (Refereed) Published
Abstract [en]

This work reports on the unstable region and the transition process of the boundary-layer flow induced by a rotating cone with a half apex angle of 60 degrees using the probability density function (PDF) contour map of the azimuthal velocity fluctuation, which was first used by Imayama et al. [Phys. Fluids 24, 031701 (2012)] for the similar boundary-layer flow induced by a rotating disk. The PDF shows that the transition behavior of the rotating-cone flow is similar to that on the rotating disk. The effects of roughness elements on the cone surface have been examined. For the cone with roughnesses, we reconstructed the most probable vortex structure within the boundary layer from the hot-wire anemometry time signals. The results show that the PDF clearly describes the overturning process of the high-momentum upwelling of the spiral vortices, which due to vortex meandering cannot be detected in the phase-averaged velocity field reconstructed from the point measurements. At a late stage of the overturning process, our hot-wire measurements captured high-frequency oscillations, which may be related to secondary instability.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 4, no 5, article id 053903
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-271993DOI: 10.1103/PhysRevFluids.4.053903ISI: 000470895200002Scopus ID: 2-s2.0-85067114346OAI: oai:DiVA.org:kth-271993DiVA, id: diva2:1423436
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QC 20200414

Available from: 2020-04-14 Created: 2020-04-14 Last updated: 2022-10-24Bibliographically approved

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Kato, KentaroAlfredsson, P. HenrikLingwood, Rebecca

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