VOF기법 및 식별 알고리즘을 이용한 쇄파에서의 기포 크기 분포도 분석
- VOF기법 및 식별 알고리즘을 이용한 쇄파에서의 기포 크기 분포도 분석
- HOJUN, MOON; YOU, DONGHYUN
- Date Issued
- 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.
- Article Type
- 한국전산유체공학회지, vol. 25, no. 3, page. 135 - 141, 2020-09
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