Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 2. Cavitating and ventilating flows

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

doi:10.1017/jfm.2023.254

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Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 2. Cavitating and ventilating flows

Journal article

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Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 2. Cavitating and ventilating flows

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

Journal of fluid mechanics, Vol.965, A3

06/25/2023

DOI: 10.1017/jfm.2023.254

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Abstract

The objective of this paper is to understand the effects of waves and vaporous cavitation upon the hydrodynamic and hydroelastic responses of a flexible surface-piercing hydrofoil, adding to the subcavitating results presented in Part 1. In general, the presence of a sufficiently large vaporous cavitation bubble facilitated the formation of a ventilated cavity, substantially reducing the angle of attack or speed required to induce fully ventilated flow, relative to subcavitating conditions. A new co-analysis procedure was used to isolate synchronous hydrodynamic modes and structural operating deflection shapes. Significant dynamic load amplification occurred when the resonant frequencies of the first twisting and second bending modes coalesced in both fully wetted and partially cavitating flows. The presence of waves did not diminish the effect of frequency coalescence, but did encourage intermittent lock-in with both leading edge cavity shedding and trailing edge vortex shedding at certain speeds. Partial cavity shedding typically had a negligible impact on the power spectral densities of structural motions because of incoherent cavity shedding. However, lock-in between the cavity shedding frequency and modal coalescence frequency led to shifting of the primary frequency peak, as well as amplified harmonics and interactions between the cavity shedding frequency and vortex shedding frequency. The transition from partially cavitating to fully ventilated flow caused sudden and large drops in the mean hydrodynamic loads and deformations, as well as substantial reductions in the intensity of the fluctuations.

Drops and Bubbles: Cavitation

Multiphase and Particle-laden Flows: Gas/liquid flow

UIOWA OA Agreement

Details

Title: Subtitle: Wave effects on the hydroelastic response of a surface-piercing hydrofoil. Part 2. Cavitating and ventilating flows
Creators: Yin Lu Young - University of Michigan
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.965, A3
DOI: 10.1017/jfm.2023.254
ISSN: 0022-1120
eISSN: 1469-7645
Publisher: Cambridge University Press
Number of pages: 38
Grant note: DOI: 10.13039/100000006, name: Office of Naval Research, award: N00014-18-C-1025; DOI: 10.13039/100000006, name: Office of Naval Research, award: N00014-21-1-2542
Language: English
Date published: 06/25/2023
Academic Unit: Mechanical Engineering
Record Identifier: 9984472857202771

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