Homogenization-based design of microstructured membranes: Wake flows past permeable shells
Ledda P. G.
;
2021-01-01
Abstract
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.File | Size | Format | |
---|---|---|---|
ledda_et_al_jfm_2021_hom.pdf Open Access from 31/03/2022
Type: versione post-print
Size 4.67 MB
Format Adobe PDF
|
4.67 MB | Adobe PDF | View/Open |
homogenization-based-design-of-microstructured-membranes-wake-flows-past-permeable-shells.pdf Solo gestori archivio
Description: versione editoriale
Type: versione editoriale
Size 5.91 MB
Format Adobe PDF
|
5.91 MB | Adobe PDF | & nbsp; View / Open Request a copy |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.