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On two-dimensional moonpool resonance for twin bodies in a two-layer fluid
Abstract This paper studies the moonpool resonance of two heaving rectangular bodies in a two-layer fluid. A mathematical model is proposed based on an eigenfunction matching approach. The motion of the two-dimensional bodies is assumed to be vertical and harmonic. Heave added mass and damping coefficients are computed to examine the hydrodynamic behavior of the twin bodies. The free surface and internal wave elevations are obtained near the resonant frequencies. The presented results and analyses reveal that there exist both Helmholtz and higher-order resonances in the two-layer fluid system, which is similar to the single-layer fluid case. It is also found that the resonances are closely associated with the free surface elevation inside moonpool gap, not the wave elevation at the interfacial surface. In addition, parametric studies have been performed to identify the dependencies of hydrodynamic behavior on geometry and density stratification.
Highlights ▸ We study the two-dimensional moonpool resonance in a two-layer fluid. ▸ Both Helmholtz and higher-order resonances are identified for a two-layer fluid. ▸ We examine the dependence of hydrodynamic behavior on the moonpool geometry and fluid stratification for both intermediate-draft body and deep-draft body.
On two-dimensional moonpool resonance for twin bodies in a two-layer fluid
Abstract This paper studies the moonpool resonance of two heaving rectangular bodies in a two-layer fluid. A mathematical model is proposed based on an eigenfunction matching approach. The motion of the two-dimensional bodies is assumed to be vertical and harmonic. Heave added mass and damping coefficients are computed to examine the hydrodynamic behavior of the twin bodies. The free surface and internal wave elevations are obtained near the resonant frequencies. The presented results and analyses reveal that there exist both Helmholtz and higher-order resonances in the two-layer fluid system, which is similar to the single-layer fluid case. It is also found that the resonances are closely associated with the free surface elevation inside moonpool gap, not the wave elevation at the interfacial surface. In addition, parametric studies have been performed to identify the dependencies of hydrodynamic behavior on geometry and density stratification.
Highlights ▸ We study the two-dimensional moonpool resonance in a two-layer fluid. ▸ Both Helmholtz and higher-order resonances are identified for a two-layer fluid. ▸ We examine the dependence of hydrodynamic behavior on the moonpool geometry and fluid stratification for both intermediate-draft body and deep-draft body.
On two-dimensional moonpool resonance for twin bodies in a two-layer fluid
Zhang, Xinshu (author) / Bandyk, Piotr (author)
Applied Ocean Research ; 40 ; 1-13
2012-11-08
13 pages
Article (Journal)
Electronic Resource
English
On two-dimensional moonpool resonance for twin bodies in a two-layer fluid
| Online Contents | 2013
MOONPOOL OPENING AND CLOSING APPARATUS IN TWIN BODY TYPE DIVING BOAT
European Patent Office | 2018