On wave diffraction of two-dimensional moonpools in a two-layer fluid with finite depth
Xu, Xin and Song, Xingyu and Zhang, Xinshu and Yuan, Zhiming (2019) On wave diffraction of two-dimensional moonpools in a two-layer fluid with finite depth. Ocean Engineering, 173. pp. 571-586. ISSN 0029-8018 (https://doi.org/10.1016/j.oceaneng.2018.12.037)
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Abstract
This paper studies the wave diffraction problem of two-dimensional moonpools in a two-layer fluid by using domain decomposition scheme and the method of eigenfunction expansion. Wave exciting forces, free surface and internal wave elevations are computed and analyzed for both surface wave and internal wave modes. The present model is validated by comparing a limiting case with a single-layer fluid case. Both piston mode and sloshing mode resonances have been identified and analyzed. It is observed that, compared with the solutions in surface wave mode, the wave exciting forces in internal wave mode are much smaller, and show more peaks and valleys in low-frequency region. As the wave frequency increases, the bandwidth of sloshing mode resonances decreases. Extensive parametric studies have been performed to examine the effects of moonpool geometry and density stratification on the resonant wave motion and exciting forces. It is found that, for twin bodies with deep draft in surface wave mode, the decreasing density ratio has little effects on the sloshing mode resonance frequencies but can somehow suppress the horizontal wave exciting forces and surface wave elevations around piston mode resonance region. In addition, the presence of lower-layer fluid can lead to the reduction of piston mode resonance frequency.
ORCID iDs
Xu, Xin, Song, Xingyu, Zhang, Xinshu and Yuan, Zhiming ORCID: https://orcid.org/0000-0001-9908-1813;-
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Item type: Article ID code: 66815 Dates: DateEvent1 February 2019Published23 January 2019Published Online13 December 2018AcceptedSubjects: Technology > Hydraulic engineering. Ocean engineering Department: Faculty of Engineering > Naval Architecture, Ocean & Marine Engineering Depositing user: Pure Administrator Date deposited: 05 Feb 2019 10:18 Last modified: 29 Oct 2024 10:50 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/66815