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Stabilizing effect of porosity on a flapping filament
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-8209-1449
2016 (English)In: Journal of Fluids and Structures, ISSN 0889-9746, E-ISSN 1095-8622, Vol. 61, 362-375 p.Article in journal (Refereed) PublishedText
Abstract [en]

A new way of handling, simultaneously, porosity and bending resistance of a massive filament is proposed. Our strategy extends the previous methods where porosity was taken into account in the absence of bending resistance of the structure and overcomes related numerical issues. The new strategy has been exploited to investigate how porosity affects the stability of slender elastic objects exposed to a uniform stream. To understand under which conditions porosity becomes important, we propose a simple resonance mechanism between a properly defined characteristic porous time-scale and the standard characteristic hydrodynamic time-scale. The resonance condition results in a critical value for the porosity above which porosity is important for the resulting filament flapping regime, otherwise its role can be considered of little importance. Our estimation for the critical value of the porosity is in fairly good agreement with our DNS results. The computations also allow us to quantitatively establish the stabilizing role of porosity in the flapping regimes.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 61, 362-375 p.
Keyword [en]
Flutter, Porosity, Immersed boundary, Drag reduction
National Category
Computational Mathematics
URN: urn:nbn:se:kth:diva-184555DOI: 10.1016/j.jfluidstructs.2015.11.016ISI: 000371551800021ScopusID: 2-s2.0-84957892814OAI: diva2:917243
Swedish Research Council, VR-2010-3910

QC 20160406

Available from: 2016-04-06 Created: 2016-04-01 Last updated: 2016-04-06Bibliographically approved

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Bagheri, Shervin
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Stability, Transition and ControlLinné Flow Center, FLOW
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