Resolving wave and laminar boundary layer scales for gap resonance problems

Free surface oscillations in a narrow gap between elongated parallel bodies are studied numerically. As this represents both a highly resonant system and an arrangement of relevance to offshore operations, the nature of the damping is of primary interest, and has a critical role in determining the r...

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Bibliographic Details
Published in:Journal of fluid mechanics 2019-05, Vol.866, p.759-775
Main Authors: Wang, H., Wolgamot, H. A., Draper, S., Zhao, W., Taylor, P. H., Cheng, L.
Format: Article
Language:English
Subjects:
Agreements
Boundary layers
Computation
Computer simulation
Damping
Experiments
Finite volume method
Free surfaces
Friction
Harmonic excitation
JFM Papers
Laboratories
Laminar boundary layer
Offshore operations
Oscillations
Simulation
Time series
Wave groups
Wave tanks
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Summary:Free surface oscillations in a narrow gap between elongated parallel bodies are studied numerically. As this represents both a highly resonant system and an arrangement of relevance to offshore operations, the nature of the damping is of primary interest, and has a critical role in determining the response. Previous experimental work has suggested that the damping could be attributed to laminar boundary layers; here our numerical wave tank successfully resolves both wave and boundary layer scales to provide strong numerical evidence in support of this conclusion. The simulations follow the experiments in using wave groups so that the computation is tractable, and both linear and second harmonic excitation of the gap are demonstrated.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2019.115