한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
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정방형 실린더 주위 유동패턴에 대한 자유수면의 영향

EFFECTS OF THE FREE SURFACE ON THE FLOW PATTERN PAST A SQUARE CYLINDER

  • 안형수 (인하대학교 기계공학과) ;
  • 양경수 (인하대학교 기계공학과)
  • 투고 : 2016.12.05
  • 심사 : 2017.03.21
  • 발행 : 2017.03.31
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초록

The characteristics of flow past a square cylinder submerged under the free surface have been numerically studied. An immersed boundary method was adopted for implementation of the cylinder cross-section in a Cartesian grid system. Also, a level-set method was used to capture the interface of the two fluids. The case for Reynolds number 150 was examined. At the specific Reynolds number, by varying the gap ratio(0.25, 0.40, 0.55, 0.70, 1.00, 1.50, 2.50, 5.00) the effects of the free surface on the force coefficients and Strouhal number of vortex shedding were identified. The presence of the free surface very close to the cylinder significantly affects the shedding pattern, resulting in considerable deviation of the force coefficients and Strouhal number from those of the single-phase flow. In addition, the influence of Froude number was considered in this study. By increasing Froude number(0.2-0.4), flow topology change was identified at the specific gap ratios(0.40, 0.70, 1.50, 5.00).

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참고문헌

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