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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(1); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(1): 17-27. doi: https://doi.org/10.9765/KSCOE.2019.31.1.17
Bound Mode의 외중력파에 의한 항내 이상파 생성가능성에 대하여
조용준, 배정현
서울시립대학교 토목공학과
On the Feasibility of Freak Waves Formation within the Harbor Due to the Presence of Infra-Gravity Waves of Bound Mode Underlying the Ever-Present Swells
Yong Jun Cho, Jung Hyun Bae
Department of Civil Engineering, University of Seoul, 163 Seoulsiripdaero, Dongdaemun-gu, Seoul 02504 Korea
Corresponding author: Yong Jun Cho ,Tel: +82-2-6490-2427, Fax: +82-2-6490-2424, Email: young@uos.ac.kr
Received: December 8, 2018;  Revised: February 22, 2019.  Accepted: February 25, 2019.
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ABSTRACT
We carry out the numerical simulation to test a hypothesis that freak waves can be triggered by the infragravity waves of bound mode underlying the ever-present swells and its constructive interaction with swells using the Tool Box called the ihFoam that has its roots on the OpenFoam, and Bi-spectrum. Numerical simulation is implemented for the SamChcuk LNG Plant where freak waves have been reported in front of the private wharf during its construction phase due to the uncompleted northern breakwater. Infra-gravity waves of bound mode is generated using the difference wave-wave interaction between the local wind waves of 7 s and a swell of 11.4 s based on the Bi-spectrum. For the sake of comparison, numerical simulation for infra-gravity waves of free mode is also carried out. Numerical results show that stem waves along the private wharf for SamChcuk LNG Plant can be triggered by the infra-gravity waves of bound mode coming from the north, which eventually leads to freak waves when encounters the reflected waves from the south jetty.
Keywords: infra-gravity waves of bound mode, Bi-spectrum, ihFoam, RANS (Reynolds Averaged Navier-Stokes equation), VOF (Volume Of Fraction), stem waves
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