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http://dx.doi.org/10.5394/KINPR.2005.29.10.853

Development and verification of a combined method of BEM and VOF  

Kim Sang-Ho (Dep. of Civil Engineering, Kyushu Univ.)
Yamashiro Masaru (Dep. of Civil Engineering, Kyushu Univ.)
Yoshida Akinori (Dep. of Civil Engineering, Kyushu Univ.)
Hashimoto Noriaki (Dep. of Civil Engineering, Kyushu Univ.)
Lee Joong-Woo (Division of Civil and Environmental Engineering, Korea Maritime University)
Publication Information
Journal of Navigation and Port Research / v.29, no.10, 2005 , pp. 853-858 More about this Journal
Abstract
Recently, various novel numerical models based on Navier-Stokes equation have been developed for calculating wave motions in the sea with coastal or ocean structures. Among those models, Volume Of Fluid (VOF) method might be the most popular one, and it has been used for numerical simulations of wave motions including complicated phenomena of wave breakings. VOF method, however, needs enormous computation time and large computational storage memories in general, thus it is practically difficult to use this method for calculations in the case of random waves because long and stable computation (e.g for more than 100 significant wave periods) is required to obtain statistically meaningful results. On the other hand if the wave motion is potential motion, Boundary Element Method (BEM), which is a much faster and more accurate method than VOF method, can be effectively used. The aim of this study is to develop a new efficient model applicable to calculations of wave motion and/or wave-structure interactions under random waves. To achieve this, a strictly combined BEM-VOF model has been developed by making the best use of both methods' merits; VOF method is used in a restricted fluid domain around a structure where complicated phenomena of wave breakings may exist, and BEM is used in the other domains far from the disturbance where the wave motion may be assumed to be potential. The verification of the model was performed with numerical results for Stokes' 5th order wave propagation and a random wave propagation.
Keywords
Boundary Element Method; Volume of Fluid method; Combination; Wave basin; Wave channel;
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