Numerical Analysis of Reflection Characteristics of Perforated Breakwater with a Resonant Channel

Kim, Jeong-Seok; Seo, Ji-Hye; Lee, Joong-Woo; Park, Woo-Sun

Journal of Navigation and Port Research 2014;38(5):503-509.
Published online October 31, 2014.

공진수로 내장형 유공방파제의 반사특성에 관한 수치해석 연구

김정석, 서지혜, 이중우, 박우선

Numerical Analysis of Reflection Characteristics of Perforated Breakwater with a Resonant Channel

Jeong-Seok Kim, Ji-Hye Seo, Joong-Woo Lee, Woo-Sun Park

Abstract

In this study, a new concept perforated breakwater is proposed, which is having resonant channels. In the channel, perforated plate is installed for dissipating wave energy induced by flow separations. The breakwater has two advantages compared with conventional perforated breakwater having wave chamber with slotted walls. One is easy to control the target wave condition for dissipating wave energy, and the other is having the high structural safety because the structural members are not exposed to impact waves, directly. To evaluate wave reflection characteristics of the proposed breakwater, numerical experiment was carried out by using Galerkin’s finite element model based on the linear potential theory. The results indicated that considerable energy dissipation occurs near the resonant period of channel, and wave reflection characteristics are affected by channel shape, location and opening ratio.

Key Words: wave reflection;resonant channel;perforated breakwater;numerical analysis;finite element method;linear potential