粒子法による電線着雪の数値シミュレーション

抄録

We conducted reproduction of the adhering snow shape on a two-dimensional cylinder assuming wet snow using the particle based method and its comparison with the experimental results. As a preliminary calculation, the snow particle trajectory was not affected by the flow in this situation since the Stokes number of the snow particle was around 40. Thereby, only gravity is considered in the following calculation. Next, snow particle accumulation was simulated by estimating both particle number density and inter particle distance. As a result, it was possible to qualitatively obtain the snow accretion shape with surface roughness even when the diameter of the snow particles was small. Therefore, the snow surface becomes rough by applying the particle method. The predicted adhering snow height was in good agreement with experimental results. However, present results could not reproduce the snow glide and creep observed in the actual phenomenon of snow accretion. Therefore, there is a need for further improvements in snow glide and creep. Threshold value of the particle number density for snow accretion judgment affects adhered snow width, while threshold value of inter particle distance affects the snow accretion height and the number of accretion particles. In addition, the effect of changes in particle density with changes in the threshold parameters of particle number density and inter particle distance was also affected.