Journal article
Dynamic hydroelastic response of a surface-piercing strut in waves and ventilated flows
Journal of fluids and structures, Vol.94, p.102899
04/2020
DOI: 10.1016/j.jfluidstructs.2020.102899
Abstract
The objective of this work is to study the effects of waves and ventilation on the dynamic hydroelastic response of a surface-piercing strut via towing tank studies. The experimental studies are especially designed to test the hypothesis that flow conditions affect the modal response and hence structural dynamics, which in turn affect the hydrodynamic response through fluid–structure interaction, particularly near regions of mode localization such as frequency coalescence. The results showed that the modal frequencies decrease with increasing submergence, and are higher in fully ventilated flow compared to fully wetted flow. Regular, non-breaking waves lead to simple harmonic oscillations about the mean values at the encountered wave frequency for the slowly varying component of the hydrodynamic loads and tip deformations. The spectral response of the fast fluctuating component of the hydrodynamic loads and tip deformations showed peaks at the modal frequencies and vortex shedding frequencies (off the blunt trailing edge of the strut). Significant dynamic load amplifications and flow-induced vibrations were observed when the second and third modal frequencies coalesced at a submerged aspect ratio of two in fully wetted flow. In fully ventilated flow, the second and third modes separated enough to result in drastically reduced dynamic load fluctuations and flow-induced vibrations. When the submergence decreased, the separation between the modal frequencies increased, which avoided frequency coalescence in both fully wetted and fully ventilated flows. The results suggest that for cases where the wave encountered frequency is well separated from the modal frequencies, the spectral response of the fast fluctuating component of the hydrodynamic loads and tip deformations are governed by the structural response, and not by wave conditions.
Details
- Title: Subtitle
- Dynamic hydroelastic response of a surface-piercing strut in waves and ventilated flows
- Creators
- Y.L Young - Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI, United States of AmericaT Wright - Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI, United States of AmericaH Yoon - Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI, United States of AmericaC.M Harwood - IIHR - Hydroscience and Engineering, University of Iowa, Iowa City, IA, United States of America
- Resource Type
- Journal article
- Publication Details
- Journal of fluids and structures, Vol.94, p.102899
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.jfluidstructs.2020.102899
- ISSN
- 0889-9746
- eISSN
- 1095-8622
- Grant note
- DOI: 10.13039/100000006, name: Office of Naval Research
- Language
- English
- Date published
- 04/2020
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984066110202771
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