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Mathematical Problems in Engineering
Volume 2014, Article ID 424927, 13 pages
Research Article

Influences of Vorticity to Vertical Motion of Two-Dimensional Moonpool under Forced Heave Motion

1Software, DNV Korea, Busan, Republic of Korea
2Naval Architecture and Ocean Engineering, Pusan National University, Busan, Republic of Korea
3Naval Architecture & Ocean Engineering, University of Ulsan, Ulsan, Republic of Korea
4Civil Engineering, Texas A&M University, College Station, TX, USA

Received 3 October 2013; Accepted 6 February 2014; Published 30 March 2014

Academic Editor: Shaoyong Lai

Copyright © 2014 Jae-Kyung Heo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Potential (inviscid-irrotational) and Navier-Stokes equation-based (viscous) flows were numerically simulated around a 2D floating rectangular body with a moonpool; particular emphasis was placed on the piston mode through the use of finite volume method (FVM) and boundary element method (BEM) solvers. The resultant wave height and phase shift inside and outside the moonpool were compared with experimental results by Faltinsen et al. (2007) for various heaving frequencies. Hydrodynamic coefficients were compared for the viscous and potential solvers and sway and heave forces were discussed. The effects of the viscosity and vortex shedding were investigated by changing the gap size, corner shape, and viscosity. The viscous flow fields were thoroughly discussed to better understand the relevant physics and shed light on the detail flow structure at resonant frequency. Vortex shedding was found to account for the most of the damping. The viscous flow simulations agreed well with the experimental results, showing the actual role and contribution of viscosity compared to potential flow simulations.