Journal
JOURNAL OF FLUIDS AND STRUCTURES
Volume 61, Issue -, Pages 362-375Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jfluidstructs.2015.11.016
Keywords
Flutter; Porosity; Immersed boundary; Drag reduction
Categories
Funding
- PRIN project - Italian Ministry of Education [D38C1300061000]
- Italian flagship project RITMARE
- Swedish Research Council [VR-2010-3910]
- Goran Gustafsson Foundation
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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. (C) 2015 Elsevier Ltd. All rights reserved.
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