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Numerical Simulation of Wave Forces acting on Fixed Offshore Structures Using Hybrid Scheme  

Nam, Bo-Woo (Marine Structure & Plant Research Department, MOERI/KORDI)
Hong, Sa-Young (Marine Structure & Plant Research Department, MOERI/KORDI)
Kim, Yong-Hwan (Dept. of Naval Architecture and Ocean Engineering, Seoul National University)
Publication Information
Journal of Ocean Engineering and Technology / v.24, no.6, 2010 , pp. 16-22 More about this Journal
Abstract
In this paper, the diffraction problems for fixed offshore structures are solved using a hybrid scheme. In this hybrid scheme, potential-based solutions and the Navier-Stokes-based finite volume method (FVM) with a volume-of-fluid (VOF) method are combined. We introduce a buffer zone for efficient wave-making and damping. In this buffer zone, the near field solution from FVM-VOF is gradually changed to Stokes' 2nd order wave solutions. Three different models, including the truncated cylinder, sphere, and wigleyIII model, are numerically investigated in regular waves with a wave steepness of 1/30. The efficiency and accuracy of the hybrid scheme are numerically validated from results using different domain sizes and buffer zones. The wave exciting forces from the FVM-VOF simulations are compared with experiments and potential-based solutions from the higher-order boundary element method (HOBEM). This comparison shows good agreement between the hybrid scheme and potential-based solutions.
Keywords
Hybrid scheme; Wave force; Finite volume method (FVM); Volume-of-fluid (VOF) method;
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