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Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load

Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load
Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load

The objective of this research is to explore the possibility of using Passive Adaptive Composite (PAC) on structures to help control the lift generated by hydrofoils on boats such as the International Moth. Introducing composite fibres oriented at off-principal axis angles, allow a foil to passively control its pitch angle to reduce the lift generated at higher boat speeds helping to achieve a stable flight in a wide range of weather conditions. PAC utilises the inherent flexibility of a composite structure to induce a twist response under bending load which could be used to minimise the use of active control systems, or even improve the dynamic response of foils in waves. However, to design flexible foils requires numerical and experimental tools to assess the complex fluid structure interactions involved. This paper evaluates a simplified hydrofoil geometry designed to reduce its lift coefficient with increased flow speed. A coupled Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) methodology is presented to predict flexible foil performance. Validation of these numerical tools is achieved through the use of wind tunnel experiments including full field deformation measurements. Twist deformations resulted in a reduction in the effective angle of attack by approximately 30% at higher flow speeds reducing the foil lift and drag significantly.

Fluid structure interaction, High performance sailing, Passive adaptive composites
0029-8018
1-10
Marimon Giovannetti, L.
9fada37b-24b2-4235-aa91-e8c25837953d
Banks, J.
3e915107-6d17-4097-8e77-99c40c8c053d
Ledri, M.
053e1dab-e898-4db5-9535-e34f0b4b0240
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Boyd, S.W.
bcbdefe0-5acf-4d6a-8a16-f4abf7c78b10
Marimon Giovannetti, L.
9fada37b-24b2-4235-aa91-e8c25837953d
Banks, J.
3e915107-6d17-4097-8e77-99c40c8c053d
Ledri, M.
053e1dab-e898-4db5-9535-e34f0b4b0240
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Boyd, S.W.
bcbdefe0-5acf-4d6a-8a16-f4abf7c78b10

Marimon Giovannetti, L., Banks, J., Ledri, M., Turnock, S.R. and Boyd, S.W. (2018) Toward the development of a hydrofoil tailored to passively reduce its lift response to fluid load. Ocean Engineering, 167, 1-10. (doi:10.1016/j.oceaneng.2018.08.018).

Record type: Article

Abstract

The objective of this research is to explore the possibility of using Passive Adaptive Composite (PAC) on structures to help control the lift generated by hydrofoils on boats such as the International Moth. Introducing composite fibres oriented at off-principal axis angles, allow a foil to passively control its pitch angle to reduce the lift generated at higher boat speeds helping to achieve a stable flight in a wide range of weather conditions. PAC utilises the inherent flexibility of a composite structure to induce a twist response under bending load which could be used to minimise the use of active control systems, or even improve the dynamic response of foils in waves. However, to design flexible foils requires numerical and experimental tools to assess the complex fluid structure interactions involved. This paper evaluates a simplified hydrofoil geometry designed to reduce its lift coefficient with increased flow speed. A coupled Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) methodology is presented to predict flexible foil performance. Validation of these numerical tools is achieved through the use of wind tunnel experiments including full field deformation measurements. Twist deformations resulted in a reduction in the effective angle of attack by approximately 30% at higher flow speeds reducing the foil lift and drag significantly.

Text
OE-D-17-01181R2 - Accepted Manuscript
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More information

Accepted/In Press date: 9 August 2018
e-pub ahead of print date: 23 August 2018
Published date: 1 November 2018
Keywords: Fluid structure interaction, High performance sailing, Passive adaptive composites

Identifiers

Local EPrints ID: 424432
URI: http://eprints.soton.ac.uk/id/eprint/424432
ISSN: 0029-8018
PURE UUID: 4512b5c4-2d7a-47a6-b576-5deb28165651
ORCID for J. Banks: ORCID iD orcid.org/0000-0002-3777-8962
ORCID for S.R. Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 05 Oct 2018 11:37
Last modified: 17 Dec 2019 05:14

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Contributors

Author: J. Banks ORCID iD
Author: M. Ledri
Author: S.R. Turnock ORCID iD
Author: S.W. Boyd

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