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A body force model to assess the impact of a swimmer’s arm on propelled swimming resistance

A body force model to assess the impact of a swimmer’s arm on propelled swimming resistance
A body force model to assess the impact of a swimmer’s arm on propelled swimming resistance
The dynamic forces acting on a swimmer’s body are notoriously difficult to measure experimentally, thus motivating many researchers to use computational fluid dynamics to assess the propulsion and resistance forces. To assess both the thrust generated and the self-propelled resistance, fully dynamic simulations are required, including the large range of body motions involved in swimming. This comes with a heavy computational cost and often limits the ability of the method to resolve detailed flow features associated with resistance force. This article applies a body force approach to propelled swimming simulations by combining an unsteady Reynolds Averaged Navier–Stokes simulation of the passive resistance with momentum source terms which accelerate the fluid in the location of the arm to represent the impact the arm has on the flow. Both passive and active towed swimming experiments were conducted and compared with the simulations. Despite observing a 24% variation in the pressure resistance associated with the arm entry, the arms had no significant effect on the mean propelled resistance of a swimmer. The passive resistance methodology agreed well with experimental data.
1754-3371
Banks, Joseph
3e915107-6d17-4097-8e77-99c40c8c053d
Phillips, Alexander
f565b1da-6881-4e2a-8729-c082b869028f
Hudson, Dominic
3814e08b-1993-4e78-b5a4-2598c40af8e7
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Banks, Joseph
3e915107-6d17-4097-8e77-99c40c8c053d
Phillips, Alexander
f565b1da-6881-4e2a-8729-c082b869028f
Hudson, Dominic
3814e08b-1993-4e78-b5a4-2598c40af8e7
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce

Banks, Joseph, Phillips, Alexander, Hudson, Dominic and Turnock, Stephen (2019) A body force model to assess the impact of a swimmer’s arm on propelled swimming resistance. Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology. (doi:10.1177/1754337119872663).

Record type: Article

Abstract

The dynamic forces acting on a swimmer’s body are notoriously difficult to measure experimentally, thus motivating many researchers to use computational fluid dynamics to assess the propulsion and resistance forces. To assess both the thrust generated and the self-propelled resistance, fully dynamic simulations are required, including the large range of body motions involved in swimming. This comes with a heavy computational cost and often limits the ability of the method to resolve detailed flow features associated with resistance force. This article applies a body force approach to propelled swimming simulations by combining an unsteady Reynolds Averaged Navier–Stokes simulation of the passive resistance with momentum source terms which accelerate the fluid in the location of the arm to represent the impact the arm has on the flow. Both passive and active towed swimming experiments were conducted and compared with the simulations. Despite observing a 24% variation in the pressure resistance associated with the arm entry, the arms had no significant effect on the mean propelled resistance of a swimmer. The passive resistance methodology agreed well with experimental data.

Text
SEP rev JSET 18-0067R2_V2 - Accepted Manuscript
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Accepted/In Press date: 30 July 2019
e-pub ahead of print date: 9 September 2019

Identifiers

Local EPrints ID: 434291
URI: http://eprints.soton.ac.uk/id/eprint/434291
ISSN: 1754-3371
PURE UUID: 69c3a124-2391-4493-8b1e-6bc36ebf29af
ORCID for Joseph Banks: ORCID iD orcid.org/0000-0002-3777-8962
ORCID for Alexander Phillips: ORCID iD orcid.org/0000-0003-3234-8506
ORCID for Dominic Hudson: ORCID iD orcid.org/0000-0002-2012-6255
ORCID for Stephen Turnock: ORCID iD orcid.org/0000-0001-6288-0400

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Date deposited: 18 Sep 2019 16:30
Last modified: 07 Oct 2020 01:58

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