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Experimental investigation of a hydrofoil designed via hydrostructural optimization

Garg, N, Pearce, BW ORCID: 0000-0003-2189-5598, Brandner, PA ORCID: 0000-0002-6721-878X, Phillips, AW, Martins, JRRA and Young, YL 2018 , 'Experimental investigation of a hydrofoil designed via hydrostructural optimization' , Journal of Fluids and Structures, vol. 84 , pp. 243-262 , doi: 10.1016/j.jfluidstructs.2018.10.010.

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Abstract

In the last decade, there has been an increased interest in the use of multidisciplinary optimization techniques for the design of aerospace, maritime, and wind engineering systems.However, validation of numerically optimized results using experimental measurementshas been scarce. In this paper, numerical predictions are compared with experimentalmeasurements of the hydrodynamic forces, deformations, and cavitation performance for abaseline NACA 0009 hydrofoil and an optimized hydrofoil. Both hydrofoils are made of solidaluminum, and are cantilevered at the root. One of the hydrofoils is optimized using a highfidelity hydrostructural solver combined with a gradient-based optimizer, as detailed byGarg et al. (2017). The numerical predictions agree well with experimental measurementsfor both the baseline NACA 0009 and the optimized hydrofoils. For the optimized hydrofoil,the mean differences between the predicted and measured values for mean lift, dragcoefficient, and moment coefficients, are 2.9%, 5.1%, and 3.0%, respectively. For the nondimensional tip bending deflection, the mean difference is 3.4%. Although the optimizedhydrofoil is significantly thicker to withstand higher loads than the baseline, it yieldsan overall measured increase in the lift-to-drag ratio of 29% for lift coefficients rangingfrom −0.15 to 0.75 and exhibits significantly delayed cavitation inception compared tothe baseline. The improvement in hydroelastic and cavitation performance is attributedto the changes in the distribution of camber, twist, thickness, and the leading edge radiusof the optimized hydrofoil. The results validate the analysis and optimization of the highfidelity hydrostructural design optimization approach, and opens up new possibilities for the design of high-performance hydrofoils, marine propellers, and turbines.

Item Type: Article
Authors/Creators:Garg, N and Pearce, BW and Brandner, PA and Phillips, AW and Martins, JRRA and Young, YL
Keywords: Experimental, Numerical, High-fidelity hydrostructural, Multidisciplinary design optimization, Fluid–structure interaction, Cavitation
Journal or Publication Title: Journal of Fluids and Structures
Publisher: Academic Press Ltd Elsevier Science Ltd
ISSN: 0889-9746
DOI / ID Number: 10.1016/j.jfluidstructs.2018.10.010
Copyright Information:

Copyright 2018 Elsevier Ltd.

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