Performance of Shark Skin Inspired Manufactured Models for Separation Control

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dc.contributor Hubner, James P.
dc.contributor MacPhee, David W.
dc.contributor.advisor Lang, Amy W. Parsons, Jacob Chase
dc.contributor.other University of Alabama Tuscaloosa 2022-04-13T20:34:15Z 2022-04-13T20:34:15Z 2020
dc.identifier.other u0015_0000001_0004259
dc.identifier.other Parsons_alatus_0004M_14239
dc.description Electronic Thesis or Dissertation en_US
dc.description.abstract The skin of fast-swimming sharks has been shown to have mechanisms able to reduce flow separation in both laminar and turbulent flows. This study analyzes arrays of bio-inspired microflaps and scales in a separated region generated by an adverse pressure gradient in a water tunnel environment. In the laminar boundary layer case, the microflap model bristles due to vortex interaction. This bristling controls the separation downstream of the model, reducing overall reversing flow by up to 59%. This investigation finds that the height of the protrusion into the boundary layer is an crucial factor in controlling the reversing flow. For the turbulent boundary layer, arrays of manufactured scales are tested in weak and strong adverse pressure gradients, controlled by a rotating cylinder. It has been found that the scales are ineffective at controlling separation in the weaker adverse pressure gradient case and increase the separation. However, in the stronger adverse pressure gradient conditions, the scales are highly effective at controlling separation, reducing the reversing flow by up to 70%. Additionally, the models are able to reattach the flow in extreme separation conditions. en_US
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated. en_US
dc.subject Bio-inspired
dc.subject boundary layer
dc.subject drag reduction
dc.subject flow separation
dc.subject passive flow control
dc.subject shark skin
dc.title Performance of Shark Skin Inspired Manufactured Models for Separation Control en_US
dc.type thesis
dc.type text University of Alabama. Department of Aerospace Engineering and Mechanics Fluid mechanics The University of Alabama master's M.S.

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