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Linear global stability of two incompressible coaxial jets
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0003-3211-4347
2017 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 824, 886-911 p.Article in journal (Refereed) Published
Abstract [en]

The linear stability of two incompressible coaxial jets, separated by a thick duct wall, is investigated by means of both a modal and a non-modal approach within a global framework. The attention is focused on the range of unitary velocity ratios for which an alternate vortex shedding from the duct wall is known to dominate the flow. In spite of the inherent convective nature of jet flow instabilities, such behaviour is shown to originate from an unstable global mode of the dynamics linearised around the axisymmetric base flow. The corresponding wavemaker is located in the recirculating-flow region formed behind the duct wall. At the same time, the transient-growth analysis reveals that huge amplifications (up to 20 orders of magnitude) of small flow perturbations at the nozzle exit can occur in the subcritical regime, especially for high ratios between the outer and the inner velocities.

Place, publisher, year, edition, pages
Cambridge University Press, 2017. Vol. 824, 886-911 p.
National Category
Applied Mechanics Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-211736DOI: 10.1017/jfm.2017.290ISI: 000405661300018Scopus ID: 2-s2.0-85023749193OAI: oai:DiVA.org:kth-211736DiVA: diva2:1133644
Note

QC 20170816

Available from: 2017-08-16 Created: 2017-08-16 Last updated: 2017-08-16Bibliographically approved

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Canton, Jacopo

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