Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Study on the Effects of Surface Roughness and Turbulence Intensity on Dam-break Flows

댐 붕괴 유동에 미치는 표면 거칠기와 난류강도 변화의 영향 연구

  • Park, Il-Ryong (Department of Naval Architecture and Ocean Engineering, Dong-Eui University) ;
  • Jung, Kwang-Hyo (Department of Naval Architecture and Ocean Engineering, Dong-Eui University)
  • 박일룡 (동의대학교 조선해양공학과) ;
  • 정광효 (동의대학교 조선해양공학과)
  • Received : 2011.12.29
  • Accepted : 2012.05.15
  • Published : 2012.06.20
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Abstract

Dam-break flows, a type of very shallow gravity-driven flow, are substantially influenced by resistance forces due to viscous friction and turbulence. Assuming turbulent flow, the main focus of this study is to validate the increase of drag forces caused by surface roughness and especially turbulence intensity. A Reynolds Averaged Navier-Stokes(RANS) approach with the standard k-${\varepsilon}$ turbulence model is used for this study, where the free surface motion is captured by using a volume of fluid(VOF) method. Surface roughness effects are considered through the law of the wall modified for roughness, while the initial turbulence intensity which determines the lowest level of turbulence in the flow domain of interest is used for the variation of turbulence intensity. It has been found that the numerical results at higher turbulence intensities show a reasonably good agreement with the physical aspects shown by two different dam-break experiments without and with the impact of water.

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