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Flow over seal whiskers: Importance of geometric features for force and frequency response

The complex undulated geometry of seal whiskers has been shown to substantially modify the turbulent structures directly downstream, resulting in a reduction of hydrodynamic forces as well as modified vortex-induced-vibration response when compared with smooth whiskers. Although the unique hydrodyna...

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Detalles Bibliográficos
Autores principales: Lyons, Kathleen, Murphy, Christin T., Franck, Jennifer A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7595378/
https://www.ncbi.nlm.nih.gov/pubmed/33119653
http://dx.doi.org/10.1371/journal.pone.0241142
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author Lyons, Kathleen
Murphy, Christin T.
Franck, Jennifer A.
author_facet Lyons, Kathleen
Murphy, Christin T.
Franck, Jennifer A.
author_sort Lyons, Kathleen
collection PubMed
description The complex undulated geometry of seal whiskers has been shown to substantially modify the turbulent structures directly downstream, resulting in a reduction of hydrodynamic forces as well as modified vortex-induced-vibration response when compared with smooth whiskers. Although the unique hydrodynamic response has been well documented, an understanding of the fluid flow effects from each geometric feature remains incomplete. In this computational investigation, nondimensional geometric parameters of the seal whisker morphology are defined in terms of their hydrodynamic relevance, such that wavelength, aspect ratio, undulation amplitudes, symmetry and undulation off-set can be varied independently of one another. A two-factor fractional factorial design of experiments procedure is used to create 16 unique geometries, each of which dramatically amplifies or attenuates the geometric parameters compared with the baseline model. The flow over each unique topography is computed with a large-eddy simulation at a Reynolds number of 500 with respect to the mean whisker thickness and the effects on force and frequency are recorded. The results determine the specific fluid flow impact of each geometric feature which will inform both biologists and engineers who seek to understand the impact of whisker morphology or lay out a framework for biomimetic design of undulated structures.
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spelling pubmed-75953782020-11-02 Flow over seal whiskers: Importance of geometric features for force and frequency response Lyons, Kathleen Murphy, Christin T. Franck, Jennifer A. PLoS One Research Article The complex undulated geometry of seal whiskers has been shown to substantially modify the turbulent structures directly downstream, resulting in a reduction of hydrodynamic forces as well as modified vortex-induced-vibration response when compared with smooth whiskers. Although the unique hydrodynamic response has been well documented, an understanding of the fluid flow effects from each geometric feature remains incomplete. In this computational investigation, nondimensional geometric parameters of the seal whisker morphology are defined in terms of their hydrodynamic relevance, such that wavelength, aspect ratio, undulation amplitudes, symmetry and undulation off-set can be varied independently of one another. A two-factor fractional factorial design of experiments procedure is used to create 16 unique geometries, each of which dramatically amplifies or attenuates the geometric parameters compared with the baseline model. The flow over each unique topography is computed with a large-eddy simulation at a Reynolds number of 500 with respect to the mean whisker thickness and the effects on force and frequency are recorded. The results determine the specific fluid flow impact of each geometric feature which will inform both biologists and engineers who seek to understand the impact of whisker morphology or lay out a framework for biomimetic design of undulated structures. Public Library of Science 2020-10-29 /pmc/articles/PMC7595378/ /pubmed/33119653 http://dx.doi.org/10.1371/journal.pone.0241142 Text en https://creativecommons.org/publicdomain/zero/1.0/ This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (https://creativecommons.org/publicdomain/zero/1.0/) public domain dedication.
spellingShingle Research Article
Lyons, Kathleen
Murphy, Christin T.
Franck, Jennifer A.
Flow over seal whiskers: Importance of geometric features for force and frequency response
title Flow over seal whiskers: Importance of geometric features for force and frequency response
title_full Flow over seal whiskers: Importance of geometric features for force and frequency response
title_fullStr Flow over seal whiskers: Importance of geometric features for force and frequency response
title_full_unstemmed Flow over seal whiskers: Importance of geometric features for force and frequency response
title_short Flow over seal whiskers: Importance of geometric features for force and frequency response
title_sort flow over seal whiskers: importance of geometric features for force and frequency response
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7595378/
https://www.ncbi.nlm.nih.gov/pubmed/33119653
http://dx.doi.org/10.1371/journal.pone.0241142
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