A Numerical Analysis of an Unsteady Flow in a Cavity Using an Ekman Pumping Model

J. Ocean Eng. Technol. 1997;11(4):102-110.

에크만 분출 모델을 이용한 캐버티 내의 비정상 유동특성에 관한 수치해석

서용권,박춘근,최윤환,문종춘

동아대학교 기계공학과,동아대학교 기계공학과,동아대학교 기계공학과,경동전문대학 건축설비과

Keywords: Ekman Pumping Effect, Vortex, Rectangular Cavity, Residual Flows

핵심용어: 에크만 분출 효과, 와도, 직사각형 케버티, 잔류유동

Abstract

A two dimensional shallow-water flow around a cavity driven by a sinusoidally oscillating external flow was studied numerically with an Ekman pumping model. A container model of "T" shape was constructed in the numerical computation for comparison with the experimental observation. The material transport in the external region is in good agreement with the experimentally recorded particle trajectories. It turns out that two large coherent vortices situated in the exterior region of the cavity are responsible for clockwise and counterclockwise drift motions, in large scale, of particles. The Ekman pumping model suggested in this study was found to be satisfactory.isfactory.