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research article

Homogenization-based design of microstructured membranes: wake flows past permeable shells

Ledda, Pier Giuseppe  
•
Boujo, E.
•
Camarri, S.
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September 29, 2021
Journal of Fluid Mechanics

A formal framework to characterize and control/optimize the flow past permeable membranes by means of a homogenization approach is proposed and applied to the wake flow past a permeable cylindrical shell. From a macroscopic viewpoint, a Navier-like effective stress jump condition is employed to model the presence of the membrane, in which the normal and tangential velocities at the membrane are respectively proportional to the so-called filtrability and slip numbers multiplied by the stresses. Regarding the particular geometry considered here, a characterization of the steady flow for several combinations of constant filtrability and slip numbers shows that the flow morphology is dominantly influenced by the filtrability and exhibits a recirculation region that moves downstream of the body and eventually disappears as this number increases. A linear stability analysis further shows the suppression of vortex shedding as long as large values of the filtrability number are employed. In the control/optimization phase, specific objectives for the macroscopic flow are formulated by adjoint methods. A homogenization-based inverse procedure is proposed to obtain the optimal constrained microscopic geometry from macroscopic objectives, which accounts for fast variations of the filtrability and slip profiles along the membrane. As a test case for the proposed design methodology, a cylindrical membrane is designed to maximize the resulting drag coefficient.

  • Details
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Type
research article
DOI
10.1017/jfm.2021.756
Web of Science ID

WOS:000700897800001

Author(s)
Ledda, Pier Giuseppe  
Boujo, E.
Camarri, S.
Gallaire, F.  
Zampogna, G. A.
Date Issued

2021-09-29

Publisher

Cambridge University Press

Published in
Journal of Fluid Mechanics
Volume

927

Start page

A31

Subjects

Mechanics

•

Physics, Fluids & Plasmas

•

Physics

•

flow control

•

membranes

•

porous media

•

stability analysis

•

drag reduction

•

instability

•

cylinder

•

sensitivity

•

technology

•

fluid

•

disks

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LFMI  
Available on Infoscience
October 9, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/181963
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