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VOF기법 및 식별 알고리즘을 이용한 쇄파에서의 기포 크기 분포도 분석

Title
VOF기법 및 식별 알고리즘을 이용한 쇄파에서의 기포 크기 분포도 분석
Authors
HOJUN, MOONYOU, DONGHYUN
Date Issued
Sep-2020
Publisher
한국전산유체공학회
Abstract
A numerical simulation of a three-dimensional breaking wave is conducted using a VOF (volume-of-fluid) method to investigate the wave breaking dynamics and the bubble size distribution. The wave is initialized using the third-order Stokes wave solution. The initial wave slope and velocity fields generate turbulent wave breaking. Various interfacial phenomena are observed including a jet forming, a jet impacting to the free-surface, ejecting spray, entraining air pocket, and breakup. Bubbles with various sizes are formed from turbulent breakup of the air pocket during active breaking time. To obtain the bubble size distribution, an identification algorithm is proposed to accurately count independent bubbles. The proposed algorithm successfully identified independent bubble structures. A joining algorithm is also introduced to consider bubble structures spanning multiple blocks for parallel computations. The obtained bubble size distribution averaged during active breaking time is proportional to r^-10/3 for radii larger than the Hinze scale and shows good agreement with previous experiment and simulation results as well as the theoretical model.
URI
http://oasis.postech.ac.kr/handle/2014.oak/104247
ISSN
1598-6071
Article Type
Article
Citation
한국전산유체공학회지, vol. 25, no. 3, page. 135 - 141, 2020-09
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유동현YOU, DONGHYUN
Dept of Mechanical Enginrg
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