• Title/Summary/Keyword: 3차풍상미분

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Computation of Free Surface Flows and Detection of Sub-Breaking (자유표면파 계산 및 준쇄파 수치연구)

  • Kwag, Seung-Hyun
    • Journal of Ocean Engineering and Technology
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    • v.13 no.3 s.33
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    • pp.114-122
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    • 1999
  • 준쇄파(쇄파발생정 리플형태의 불안정파)를 수치적으로 해석하고 예측하기 위하여 수중날개를 대상으로 점성유동장의 계산을 수행하였다. Navier-Stokes 방정식을 사용하여 자유수면을 계산하였고 정도향상을 위하여 Euler 형태의 자유표면조건에 고차의 유한차문법을 적용하였다. 이산화 과정에서 자유표면 격자에 3차 풍상미분항을 적용시켜 수치계산을 수행하였고, 계산결과를 사용하여 준쇄파의 생성조건을 규명하였다.

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Simulation of Viscous Flow around the Moving Underwater Vehicle

  • Kwag, Seung-Hyun
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.10a
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    • pp.202-206
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    • 2001
  • A three dimensional incompressible Navier-Stokes code based on the third derivative upwind is employed to simulate the flow around the underwater vehicle advancing on the calm water. Computations are carried out in the range of Froude numbers 0.4 to 0.7. The wave resistance, lift, moment and the pressure distribution on the body are calculated. Computations are performed in a rectangular grid system based on the Marker & Cell method. For validation, computation results are compared with existing experimental results.

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