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Boundary-layer transition over a rotating broad cone
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-5532-2379
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1146-3241
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. Department of Mechanical and Aerospace Engineering, Brunel University London, Uxbridge, UB8 3PH, United Kingdom.
2019 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 4, no 7, article id 071902Article in journal (Refereed) Published
Abstract [en]

The route to turbulence in the boundary layer on a rotating broad cone is investigated using hot-wire anemometry measuring the azimuthal velocity. The stationary fundamental mode is triggered by 24 deterministic small roughness elements distributed evenly at a specific distance from the cone apex. The stationary vortices, having a wave number of 24, correspond to the fundamental mode and these are initially the dominant disturbance-energy carrying structures. This mode is found to saturate and is followed by rapid growth of the nonstationary primary mode as well as the stationary and nonstationary first harmonics, leading to transition to turbulence. The amplitudes of these are plotted in a way to highlight the continued growth after saturation of the fundamental stationary mode.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 4, no 7, article id 071902
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-262558DOI: 10.1103/PhysRevFluids.4.071902ISI: 000478049100001Scopus ID: 2-s2.0-85070306680OAI: oai:DiVA.org:kth-262558DiVA, id: diva2:1361859
Note

QC 20191017

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17Bibliographically approved

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Kato, KentaroAlfredsson, P. HenrikLingwood, Rebecca

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