Instabilities in the boundary layer over a permeable, compliant wall

Local linear stability of swept and unswept incompressible boundary layers developing over compliant, fluid-saturated, porous plates is considered in the limit of small permeability. The analysis is meant to yield preliminary indications on the possible stabilization induced on the flow's hydro...

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Bibliographic Details
Published in:Physics of fluids (1994) 2014-08, Vol.26 (8), p.084103-1
Main Authors: Pluvinage, Franck, Kourta, Azeddine, Bottaro, Alessandro
Format: Article
Language:English
Subjects:
Boundary layer stability
Coating effects
Cross flow
Damping
Engineering Sciences
Fluid dynamics
Fluid flow
Fluid mechanics
Fluids mechanics
Flutter
Incompressible flow
Mechanics
Passive control
Permeability
Physics
Porous plates
Traveling waves
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Summary:Local linear stability of swept and unswept incompressible boundary layers developing over compliant, fluid-saturated, porous plates is considered in the limit of small permeability. The analysis is meant to yield preliminary indications on the possible stabilization induced on the flow's hydrodynamic and hydroelastic modes by poroelastic media, such as those occurring in many natural and technological settings. As far as hydrodynamic modes are concerned, the main stabilizing effect is that of compliance, which however couples weakly to low-frequency crossflow modes. Permeability plays a damping role on hydroelastic modes, which here take the form of travelling wave flutter instabilities. The passive control of instabilities through poroelastic coatings specifically designed to selectively exploit the effect of compliance and/or permeability is a subject worthy of future research efforts.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4892086