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Analytic modeling of a size-changing swimmer

Analytic modeling of a size-changing swimmer
Analytic modeling of a size-changing swimmer
Cephalopods use large-scale structural deformation to propel themselves underwater, changing their internal volume by 20-50%. In this work, the hydroelastic response of a swimmer comprised of a fluid-filled elastic-membrane is studied via an analytic formulation of two coupled non-linear dynamic equations. This model of the self-propelled soft-body dynamics incorporates the inter- play of the external and internal added-mass variations. We compare the model against recent experiments for a body which abruptly reduces its cross-section to eject a single jet of fluid mass. Using the model we study the impact of size-change excitation on sustained swimming speeds and efficiency.
International Union of Theoretical and Applied Mechanics
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Giorgio-Serchi, Francesco
8571dc14-19c1-4ed1-8080-d380736a6ffa
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Giorgio-Serchi, Francesco
8571dc14-19c1-4ed1-8080-d380736a6ffa

Weymouth, Gabriel and Giorgio-Serchi, Francesco (2018) Analytic modeling of a size-changing swimmer. In IUTAM Symposium on Critical flow dynamics involving moving/deformable structures with design applications. International Union of Theoretical and Applied Mechanics..

Record type: Conference or Workshop Item (Paper)

Abstract

Cephalopods use large-scale structural deformation to propel themselves underwater, changing their internal volume by 20-50%. In this work, the hydroelastic response of a swimmer comprised of a fluid-filled elastic-membrane is studied via an analytic formulation of two coupled non-linear dynamic equations. This model of the self-propelled soft-body dynamics incorporates the inter- play of the external and internal added-mass variations. We compare the model against recent experiments for a body which abruptly reduces its cross-section to eject a single jet of fluid mass. Using the model we study the impact of size-change excitation on sustained swimming speeds and efficiency.

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Weymouth_IUTAM_Symposium_Santorini_2018 - Accepted Manuscript
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Published date: June 2018
Venue - Dates: IUTAM SYMPOSIUM SANTORINI 2018<br/>: “Critical flow dynamics involving moving/deformable structures with design applications”, , Santorini, Greece, 2018-06-17 - 2018-06-21

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Local EPrints ID: 421567
URI: http://eprints.soton.ac.uk/id/eprint/421567
PURE UUID: 2a568dab-2a5b-4c70-9d8d-cc2a99e6e16c
ORCID for Gabriel Weymouth: ORCID iD orcid.org/0000-0001-5080-5016
ORCID for Francesco Giorgio-Serchi: ORCID iD orcid.org/0000-0002-5090-9007

Catalogue record

Date deposited: 15 Jun 2018 16:30
Last modified: 18 Feb 2021 17:21

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