Numerical Simulation of a Near shore Tsunami Using a Digital Wave Tank Simulation Technique

J. Ocean Eng. Technol. 2003;17(6):7-15.

디지털 수치수조 기법에 의한 연안 Tsunami의 수치 시뮬레이션

박종천,전호환

부산대학교 조선해양공학과,부산대학교 조선해양공학과

Keywords: Nearshore Tsunami, Nonlinear Wave Motions, CFD Technique, Navier-Stokes Equations, Ohkushiri Island, Digital Wave Tank, CIS

핵심용어: 연안 쓰나미, 비선형성 파동, CFD 기술, N-S 방정식, Ohkushir 섬, 디지털 파랑수조, 공유

Abstract

A Digital Wave Tank simulation technique, based on a finite-difference method and a modified marker-and-cell (MAC) algorithm, is applied in order to investigate the characteristics of nonlinear Tsunami propagations and their interactions with a 2D sloping beach, Ohkushiri Island, and to predict maximum wove run-up around the island. The Navier-Stokes (NS) and continuity equation are governed in the computational domain, and the boundary values are updated at each time step, by a finite-difference time-marching scheme in the frame of the rectangular coordinate system. The fully nonlinear, kinematic, free-surface condition is satisfied by the modified marker-density function technique. The near shore Tsunami is assumed to be a solitary wave, and is generated from the numerical wave-maker in the developed Digital Wave Tank. The simulation results are compared with the experiments and other numerical methods, based on the shallow-water wave theory.