Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 1. Fully wetted and ventilated flows

Yin Lu Young; Zachary Valles; Isaac Di Napoli; Francisco M. Montero; Luigi F. Minerva; Casey Harwood

doi:10.1017/jfm.2023.127

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Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 1. Fully wetted and ventilated flows

Journal article

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Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 1. Fully wetted and ventilated flows

Yin Lu Young, Zachary Valles, Isaac Di Napoli, Francisco M. Montero, Luigi F. Minerva and Casey Harwood

Journal of fluid mechanics, Vol.963, A37

05/25/2023

DOI: 10.1017/jfm.2023.127

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Abstract

This work describes the effects of waves on the hydroelastic response of a hydrofoil in fully wetted and ventilated flows. In the absence of vaporous cavitation (described in Part 2 of this paper series), shallow long-period non-breaking waves delayed ventilation inception because velocity fluctuations prevent the formation of a stably separated region of flow at the foil's leading edge. Aerated von Kármán vortex shedding occurred from the blunt trailing edge, producing vortex-induced vibration of the hydrofoil at a near-constant Strouhal number. Regular waves led to near sinusoidal oscillations of the load and deformations at the wave encounter frequency, while the mean response and the dynamic response at other frequency peaks corresponding to hydrodynamic and structural modes remained mostly unaffected. Significant dynamic load amplification was observed at a submerged aspect ratio of 2 for cases with low angles of attack because of coalescence between the second and third wetted structural modes; at high angles of attack, the amplitude of the load fluctuations and flow-induced vibrations reduced because energy was diverted away from the coalescence frequencies to the nearby vortex shedding frequency. In both calm water and wave conditions, transition from fully wetted to fully ventilated flow resulted in sudden and significant reduction in the load coefficients, as well as foil deflections. An impulse-like signature was observed in the time-frequency spectra during these transitions. In many of the cases, transition to fully ventilated flow also led to substantially reduced amplitudes in the load and deformation fluctuations.

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UIOWA OA Agreement

Details

Title: Subtitle: Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 1. Fully wetted and ventilated flows
Creators: Yin Lu Young - 1Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Zachary Valles - University of Michigan
Isaac Di Napoli - University of Iowa
Francisco M. Montero - Maritime Research Institute Netherlands
Luigi F. Minerva - Maritime Research Institute Netherlands
Casey Harwood - University of Iowa, Mechanical Engineering
Resource Type: Journal article
Publication Details: Journal of fluid mechanics, Vol.963, A37
DOI: 10.1017/jfm.2023.127
ISSN: 0022-1120
eISSN: 1469-7645
Publisher: Cambridge University Press
Number of pages: 51
Language: English
Date published: 05/25/2023
Academic Unit: Mechanical Engineering
Record Identifier: 9984443352102771

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