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A search for the dominant free surface-fluctuation frequency downstream of the oscillating hydraulic jump with the Bayesian spectral density approach
K M Mok; K V Yuen; K H Cheong; K I Hoi
2013-07-16
Conference Name3rd International Conference on Turbulent Mixing and Beyond
Source PublicationPhysica Scripta
Volume2013, T155
Conference DateAUG 21-28, 2011
Conference PlaceTrieste, ITALY
PublisherIOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Abstract

In this study the dynamics of the free surface fluctuation behind the oscillating hydraulic jump was modeled with a single-degree-of-freedom (SDOF) oscillator. Through the Bayesian spectral density approach, the uncertain parameters, namely the dominant frequency of the power spectrum, the damping ratio and the spectral intensity, were successfully identified based on laboratory measurements of six oscillating jumps with the Froude number ranging from 2.63 to 3.62. The identified dominant frequencies were found to be in good agreement with those estimated by a simple surface-roller generation–advection model, thus confirming the periodic large-scale turbulence formation process at the jump front. Meanwhile, the observed increase of the identified damping ratio with the Froude number is consistent with the increase of energy dissipation at higher Froude number. At the same time, the constant trend of spectral intensity implies that there is no significant change in the variance of the free surface fluctuation within the tested Froude number range.

DOIhttps://doi.org/10.1088/0031-8949/2013/T155/014007
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000321863000009
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Cited Times [WOS]:1   [WOS Record]     [Related Records in WOS]
Document TypeConference paper
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
AffiliationDepartment of Civil and Environmental Engineering, University of Macau, Macau SAR, China
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
K M Mok,K V Yuen,K H Cheong,et al. A search for the dominant free surface-fluctuation frequency downstream of the oscillating hydraulic jump with the Bayesian spectral density approach[C]:IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND,2013.
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