The resonant behavior of the fluid trapped in the narrow gap between a floating LNG and an LNG carrier in a side-by-side offloading operation is investigated in this study employing a numerical wave flume. The wave flume is based on the finite volume solution of the Navier-Stokes equations to account for the viscous dissipation. The waveFoam toolbox, a modified version of the standard OpenFOAM multiphase flow solver interFoam developed by Jacobson et al (2011) has been used for the purpose of wave generation and relaxation inside the computational domain. This method has a quite high efficiency as it takes advantage of the potential flow theory for wave generation purpose and the viscous flow theory for inside the wave tank, respectively. The volume of fluid (VOF) method first introduced by Hirt and Nichols (1981) is used to capture the free surface oscillations at the air and water interface. Water waves are generated at a reasonable distance from the inlet boundary and two rectangular relaxation zones at the inlet and outlet boundaries of the domain have been implemented to suppress wave reflection at the outer boundaries as well as waves reflected internally in the computational domain. The influence of incident wave frequency on resonance wave height and frequency is examined. Numerical results of free surface evolution at different incident wave frequency seem to agree well with the experimental results of Saitoh et al (2006) and numerical results of Lu et al (2008). In order to justify the effect of bilge keels on flow separation at the bottom corner of the ship, four different corner configurations have been investigated and compared to the base sharp edged case. It is observed that the magnitude of the free surface elevation at the resonance frequency increases significantly by about 10 times the incoming wave height while the peak of resonant frequency curves shifts to higher frequencies in the higher curvature modes compared with the base case.
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ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
June 8–13, 2014
San Francisco, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4540-0
PROCEEDINGS PAPER
Numerical Simulation of Fluid Resonance in Narrow Gap of Two Bodies in Close Proximity
Nima Moradi,
Nima Moradi
The University of Western Australia, WA, Australia
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Tongming Zhou,
Tongming Zhou
The University of Western Australia, WA, Australia
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Liang Cheng
Liang Cheng
The University of Western Australia, WA, Australia
Search for other works by this author on:
Nima Moradi
The University of Western Australia, WA, Australia
Tongming Zhou
The University of Western Australia, WA, Australia
Liang Cheng
The University of Western Australia, WA, Australia
Paper No:
OMAE2014-24348, V002T08A075; 7 pages
Published Online:
October 1, 2014
Citation
Moradi, N, Zhou, T, & Cheng, L. "Numerical Simulation of Fluid Resonance in Narrow Gap of Two Bodies in Close Proximity." Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. Volume 2: CFD and VIV. San Francisco, California, USA. June 8–13, 2014. V002T08A075. ASME. https://doi.org/10.1115/OMAE2014-24348
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