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Can Lighthill's elongated body theory predict hydrodynamic forces in underwater undulatory swimming?

Can Lighthill's elongated body theory predict hydrodynamic forces in underwater undulatory swimming?
Can Lighthill's elongated body theory predict hydrodynamic forces in underwater undulatory swimming?
Underwater Undulatory Swimming (UUS) is an area of continuing development in elite swimming. The propulsive
forces generated during UUS are investigated experimentally, during an over-speed tow, and numerically using Elongated Body Theory (EBT), developed initially for fish locomotion. Two-dimensional kinematic motion data
(foot, shank, thigh, torso, upper arm, lower arm, and hand) at 25Hz in the sagittal plane is acquired by manual
digitisation of video recorded from a stationary camera during an over-speed active tow and input into an EBT model.
Thrust (T) determined from EBT and a semi-empirical passive resistance (R) is used to estimate R-T for comparison
with the experimental tow line measurement. The forces predicted from EBT although significantly larger than the
experimental measurement indicate that the EBT has the potential, with suitable refinement, to provide detailed
insight into the hydrodynamics of UUS. Areas for further refinement are in the use of a three-dimensional correction
and that higher resolution motion data for the feet are required.
724-729
Webb, Angus P.
51154d5c-d64d-45d3-b2ce-10d9234eab2d
Phillips, Christopher W.G.
19fee27f-beb3-41ad-85be-7afb23540b7c
Hudson, Dominic A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Turnock, Stephen R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Webb, Angus P.
51154d5c-d64d-45d3-b2ce-10d9234eab2d
Phillips, Christopher W.G.
19fee27f-beb3-41ad-85be-7afb23540b7c
Hudson, Dominic A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Turnock, Stephen R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce

Webb, Angus P., Phillips, Christopher W.G., Hudson, Dominic A. and Turnock, Stephen R. (2012) Can Lighthill's elongated body theory predict hydrodynamic forces in underwater undulatory swimming? [in special issue: Engineering of Sport Conference 2012] Procedia Engineering, 34, 724-729. (doi:10.1016/j.proeng.2012.04.123).

Record type: Article

Abstract

Underwater Undulatory Swimming (UUS) is an area of continuing development in elite swimming. The propulsive
forces generated during UUS are investigated experimentally, during an over-speed tow, and numerically using Elongated Body Theory (EBT), developed initially for fish locomotion. Two-dimensional kinematic motion data
(foot, shank, thigh, torso, upper arm, lower arm, and hand) at 25Hz in the sagittal plane is acquired by manual
digitisation of video recorded from a stationary camera during an over-speed active tow and input into an EBT model.
Thrust (T) determined from EBT and a semi-empirical passive resistance (R) is used to estimate R-T for comparison
with the experimental tow line measurement. The forces predicted from EBT although significantly larger than the
experimental measurement indicate that the EBT has the potential, with suitable refinement, to provide detailed
insight into the hydrodynamics of UUS. Areas for further refinement are in the use of a three-dimensional correction
and that higher resolution motion data for the feet are required.

Other
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More information

Published date: November 2012
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 345872
URI: http://eprints.soton.ac.uk/id/eprint/345872
PURE UUID: e6b13eb3-c1cb-4e18-b7bb-b84d79b14511
ORCID for Dominic A. Hudson: ORCID iD orcid.org/0000-0002-2012-6255
ORCID for Stephen R. Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 05 Dec 2012 15:15
Last modified: 09 Jan 2022 02:47

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Contributors

Author: Angus P. Webb
Author: Christopher W.G. Phillips

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