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Effects of aspect ratio on rolling and twisting foils

Effects of aspect ratio on rolling and twisting foils
Effects of aspect ratio on rolling and twisting foils
Flapping flight and swimming are increasingly studied due to both their intrinsic scientific richness and their applicability to novel robotic systems. Strip theory is often applied to flapping wings, but such modeling is only rigorously applicable in the limit of infinite aspect ratio (AR) where the geometry and kinematics are effectively uniform. This work compares the flow features and forces of strip theory and three-dimensional flapping foils, maintaining similitude in the rolling and twisting kinematics while varying the foil AR. We find the key influence of finite AR and spanwise varying kinematics is the generation of a time-periodic spanwise flow which stabilizes the vortex structures and enhances the dynamics at the foil root. An aspect-ratio correction for flapping foils is developed analogous to Prandtl finite wing theory, enabling future use of strip theory in analysis and design of finite aspect ratio flapping foils.
2469-990X
Nasution, Andhini
b9e5a90e-08c3-4922-8307-26c420e854d8
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Nasution, Andhini
b9e5a90e-08c3-4922-8307-26c420e854d8
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0

Nasution, Andhini, Ganapathisubramani, Bharathram and Weymouth, Gabriel (2021) Effects of aspect ratio on rolling and twisting foils. Physical Review Fluids, 6 (1), [013101]. (doi:10.1103/PhysRevFluids.6.013101).

Record type: Article

Abstract

Flapping flight and swimming are increasingly studied due to both their intrinsic scientific richness and their applicability to novel robotic systems. Strip theory is often applied to flapping wings, but such modeling is only rigorously applicable in the limit of infinite aspect ratio (AR) where the geometry and kinematics are effectively uniform. This work compares the flow features and forces of strip theory and three-dimensional flapping foils, maintaining similitude in the rolling and twisting kinematics while varying the foil AR. We find the key influence of finite AR and spanwise varying kinematics is the generation of a time-periodic spanwise flow which stabilizes the vortex structures and enhances the dynamics at the foil root. An aspect-ratio correction for flapping foils is developed analogous to Prandtl finite wing theory, enabling future use of strip theory in analysis and design of finite aspect ratio flapping foils.

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Effects of Aspect Ratio - Accepted Manuscript
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e-pub ahead of print date: 15 January 2021
Published date: 15 January 2021
Additional Information: Funding Information: We would like to thank the Indonesia Endowment Fund for Education (LPDP), the IRIDIS High Performance Computing Facility with its associated support services at the University of Southampton, and Office of Naval Research Global Award No. N62909-18-1-2091 for the completion of this work. Publisher Copyright: © 2021 American Physical Society. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

Identifiers

Local EPrints ID: 446238
URI: http://eprints.soton.ac.uk/id/eprint/446238
ISSN: 2469-990X
PURE UUID: 3607ba65-3969-4672-96a4-67efccac7171
ORCID for Andhini Nasution: ORCID iD orcid.org/0000-0003-1924-3507
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486
ORCID for Gabriel Weymouth: ORCID iD orcid.org/0000-0001-5080-5016

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Date deposited: 29 Jan 2021 17:33
Last modified: 26 Nov 2021 03:24

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Author: Andhini Nasution ORCID iD

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