Evaluation of snow entrainment coefficient based on the fluid dynamical analysis of snowdrift

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  • KIKUCHI Takuro
    Department of Civil Engineering, Fukushima National College of Technology
  • FUKUSHIMA Yusuke
    Department of Civil and Environmental Engineering, Nagaoka University of Technology

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  • 吹雪流の数値解析における雪の連行係数の評価法の提案
  • フブキリュウ ノ スウチ カイセキ ニ オケル ユキ ノ レンコウ ケイスウ ノ ヒョウカホウ ノ テイアン

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Abstract

When performing the fluid dynamical analysis of snowdrift by using the equation of turbulent diffusion, it is essential to determine the boundary conditions of concentration at the bottom of the snowdrift. The concentration gradient and concentration flux are adopted as boundary conditions. The concept of snow entrainment coefficient is considered useful since it is expected to be a variable related to flow properties and snow particle properties. The κ-εturbulence model is applied as a dynamic model of the snowdrift, and the result is compared with the wind velocity profile and the snowdrift flux in the experiment by using a window tunnel. The diameter used to calculate Garcia's parameter Z is obtained by balancing the drag force and the gravitational and buoyant force of the snow particles. The diameter obtained by SPC is compared with that obtained by this method by examining the relationship between the sand and/or snow entrainment coefficient and Garcia's parameter Z.

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