Scaling laws for the propulsive performance of a purely pitching foil in ground effect
Scaling laws for the propulsive performance of a purely pitching foil in ground effect
Scaling laws for the thrust production and power consumption of a purely pitching hydrofoil in ground effect are presented. For the first time, ground-effect scaling laws based on physical insights capture the propulsive performance over a wide range of biologically relevant Strouhal numbers, dimensionless amplitudes and dimensionless ground distances. This is achieved by advancing previous scaling laws (Moored & Quinn (AIAA J., 2018, pp. 1–15)) with physics-driven modifications to the added mass and circulatory forces to account for ground distance variations. The key physics introduced are the increase in the added mass of a foil near the ground and the reduction in the influence of a wake-vortex system due to the influence of its image system. The scaling laws are found to be in good agreement with new inviscid simulations and viscous experiments, and can be used to accelerate the design of bio-inspired hydrofoils that oscillate near a ground plane or two out-of-phase foils in a side-by-side arrangement.
R1
Mivehchi, Amin
e3cd21f8-2efd-4b02-9c02-c0fe320e3d24
Zhong, Qiang
79e26067-9375-462c-855e-99d529a51888
Kurt, Melike
15dea522-b5e5-4360-8b03-7a68e543c873
Quinn, Daniel B.
d4277789-68c7-4620-8c6f-4072575f0120
Moored, Keith W.
9c89d06c-a49a-4ff0-bd32-37d9d143d39a
25 July 2021
Mivehchi, Amin
e3cd21f8-2efd-4b02-9c02-c0fe320e3d24
Zhong, Qiang
79e26067-9375-462c-855e-99d529a51888
Kurt, Melike
15dea522-b5e5-4360-8b03-7a68e543c873
Quinn, Daniel B.
d4277789-68c7-4620-8c6f-4072575f0120
Moored, Keith W.
9c89d06c-a49a-4ff0-bd32-37d9d143d39a
Mivehchi, Amin, Zhong, Qiang, Kurt, Melike, Quinn, Daniel B. and Moored, Keith W.
(2021)
Scaling laws for the propulsive performance of a purely pitching foil in ground effect.
Journal of Fluid Mechanics, 919, .
(doi:10.1017/jfm.2021.361).
Abstract
Scaling laws for the thrust production and power consumption of a purely pitching hydrofoil in ground effect are presented. For the first time, ground-effect scaling laws based on physical insights capture the propulsive performance over a wide range of biologically relevant Strouhal numbers, dimensionless amplitudes and dimensionless ground distances. This is achieved by advancing previous scaling laws (Moored & Quinn (AIAA J., 2018, pp. 1–15)) with physics-driven modifications to the added mass and circulatory forces to account for ground distance variations. The key physics introduced are the increase in the added mass of a foil near the ground and the reduction in the influence of a wake-vortex system due to the influence of its image system. The scaling laws are found to be in good agreement with new inviscid simulations and viscous experiments, and can be used to accelerate the design of bio-inspired hydrofoils that oscillate near a ground plane or two out-of-phase foils in a side-by-side arrangement.
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Accepted/In Press date: 6 April 2021
e-pub ahead of print date: 20 May 2021
Published date: 25 July 2021
Identifiers
Local EPrints ID: 474759
URI: http://eprints.soton.ac.uk/id/eprint/474759
ISSN: 0022-1120
PURE UUID: 1a85914c-2269-4349-a489-36d35c2fbd49
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Date deposited: 02 Mar 2023 17:43
Last modified: 17 Mar 2024 04:05
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Contributors
Author:
Amin Mivehchi
Author:
Qiang Zhong
Author:
Melike Kurt
Author:
Daniel B. Quinn
Author:
Keith W. Moored
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