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dc.contributor.authorGómez-de-Segura, Gen
dc.contributor.authorSharma, Akshathen
dc.contributor.authorGarcía-Mayoral, Ren
dc.date.accessioned2018-07-18T11:43:14Z
dc.date.available2018-07-18T11:43:14Z
dc.date.issued2018-01en
dc.identifier.issn1386-6184
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/278224
dc.description.abstractThe behaviour of turbulent flow over anisotropic permeable substrates is studied using linear stability analysis and direct numerical simulations (DNS). The flow within the permeable substrate is modelled using the Brinkman equation, which is solved analytically to obtain the boundary conditions at the substrate-channel interface for both the DNS and the stability analysis. The DNS results show that the drag-reducing effect of the permeable substrate, caused by preferential streamwise slip, can be offset by the wall-normal permeability of the substrate. The latter is associated with the presence of large spanwise structures, typically associated to a Kelvin-Helmholtz-like instability. Linear stability analysis is used as a predictive tool to capture the onset of these drag-increasing Kelvin-Helmholtz rollers. It is shown that the appearance of these rollers is essentially driven by the wall-normal permeability $K_{y}^+$. When realistic permeable substrates are considered, the transpiration at the substrate-channel interface is wavelength-dependent. For substrates with low $K_y^+$, the wavelength-dependent transpiration inhibits the formation of large spanwise structures at the characteristic scales of the Kelvin-Helmholtz-like instability, thereby reducing the negative impact of wall-normal permeability.
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.publisherSpringer Nature
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleTurbulent Drag Reduction Using Anisotropic Permeable Substrates.en
dc.typeArticle
prism.endingPage1014
prism.issueIdentifier4en
prism.publicationDate2018en
prism.publicationNameFlow, turbulence and combustionen
prism.startingPage995
prism.volume100en
dc.identifier.doi10.17863/CAM.25569
dcterms.dateAccepted2018-04-07en
rioxxterms.versionofrecord10.1007/s10494-018-9916-4en
rioxxterms.versionVoR*
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-01en
dc.contributor.orcidGómez-de-Segura, G [0000-0002-4572-1077]
dc.contributor.orcidGarcía-Mayoral, R [0000-0001-5572-2607]
dc.identifier.eissn1573-1987
rioxxterms.typeJournal Article/Reviewen
cam.orpheus.successThu Jan 30 12:59:49 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International