수상 함정 기포 마스크 벨트에서 생성된 기포 유동에 관한 수치해석 연구

Abstract

This paper provides the results of the basic numerical study on the bubble generation mechanism of an air bubble mask belt device to reduce engine noise by creating bubble curtain around the hull of a surface ship. To analyze two-phase flows, a large eddy simulation (LES) approach coupled with a volume of fluid (VOF) method was adopted. This numerical approach was verified by comparison with the experimental and other numerical results for a single bubble rising problem in a stationary flow field. Due to laminar and turbulent break-up phenomena, the bubble mask belt produced bubbles of various sizes ranging from 100 μ m to 3000 μ m depending on the flow conditions. The present numerical results will be used to determine the air flow rate of the mask belt and other flow conditions required to generate a desired size bubble at a given ship speed.