Numerical Analysis of Internal Waves in Two-layer Fluids by a Two-domain Boundary Element Method

J. Ocean Eng. Technol. 2009;23(4):6-11.

Koo Weon-Cheol,Kim Mi-Geun

School of Naval Architecture and Ocean Engineering University of Ulsan,School of Naval Architecture and Ocean Engineering University of Ulsan

Two-domain 경계 요소법을 이용한 해양 내부파의 수치적 재현

구원철,김미근

울산대학교 조선해양공학부,울산대학교 조선해양공학부

Keywords: Numerical wave tank, Surface wave, Internal wave, Two-layer fluids, Two-domain boundary element method

핵심용어: 수치 각수조, 해면파, 해양내부파, 두 층 유체, 두 영역 경계요소법

Abstract

In this study, the internal waves in two-density layered fluids were analyzed using the Numerical Wave Tank (NWT) technique in the frequency domain. The NWT is based on a two-domain Boundary Element Method with the potential fluids using the whole-domain matrix scheme. From the mathematical solution of the two-domain boundary integral equation, two different wave modes could be classified: a surface wave mode and an internal wave mode, and each mode were shown to have a wave number determined by a respective dispersion relation. The magnitudes of the internal waves against surface waves were investigated for various fluid densities and water depths. The calculated results are compared with available theoretical data.