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Self-sustained global oscillations in a jet in crossflow
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-8209-1449
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-7864-3071
2011 (English)In: Theoretical and Computational Fluid Dynamics, ISSN 0935-4964, E-ISSN 1432-2250, Vol. 25, no 1-4, 129-146 p.Article in journal (Refereed) Published
Abstract [en]

A jet in crossflow with an inflow ratio of 3, based on the maximum velocity of the parabolic jet profile, is studied numerically. The jet is modeled as an inhomogeneous boundary condition at the crossflow wall. We find two fundamental frequencies, pertaining to self-sustained oscillations in the flow, using full nonlinear direct numerical simulation (DNS) as well as a modal decomposition into global linear eigenmodes and proper orthogonal decomposition (POD) modes; a high frequency which is characteristic for the shear-layer vortices and the upright vortices in the jet wake, and a low frequency which is dominant in the region downstream of the jet orifice. Both frequencies can be related to a region of reversed flow downstream of the jet orifice. This region is observed to oscillate predominantly in the wall-normal direction with the high frequency, and in the spanwise direction with the low frequency. Moreover, the steady-state solution of the governing Navier-Stokes equations clearly shows the horseshoe vortices and the corresponding wall vortices further downstream, and the emergence of a distinct counter-rotating vortex pair high in the free stream. It is thus found that neither the inclusion of the jet pipe nor unsteadiness is necessary to generate the characteristic counter-rotating vortex pair.

Place, publisher, year, edition, pages
2011. Vol. 25, no 1-4, 129-146 p.
Keyword [en]
Jet in crossflow, Global instabilities, Proper orthogonal decomposition, Elliptic instability
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-34647DOI: 10.1007/s00162-010-0199-1ISI: 000291056000011Scopus ID: 2-s2.0-79958123794OAI: oai:DiVA.org:kth-34647DiVA: diva2:427122
Funder
Swedish Research CouncilSwedish e‐Science Research Center
Note
QC 20110627Available from: 2011-06-27 Created: 2011-06-13 Last updated: 2017-12-11Bibliographically approved

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Schlatter, PhilippBagheri, ShervinHenningson, Dan S.

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