粒子法を用いた電線着雪における滑り現象及び流れ場の変化に関する数値的研究

抄録

Snow accretion on electrical wires occurs due to the surface tension of melted snow and ice bonds between the snow crystal and the wire surface. Heavy snow accretion can lead to wire breakage or transmission tower collapse. Additionally, asymmetrical snow accretion causes lift imbalance that can lead to galloping, increasing the risk of wires contacting each other and resulting in short circuits. To quantitatively understand these phenomena, numerical simulations have been conducted to reproduce snow accretion. Shimura et al. employed a particle-based method to predict snow accretion on electrical wires, achieving good agreement between predicted and experimental snow height. However, the previous model did not account for snow body motion, leading to non-physical long-term snow growth. In this study, we modeled the sliding motion of the snow body on the wire surface and conducted simulations to assess long-term snow accretion. We also computed the flow field around the electric wire to investigate the impact of the snow body on the flow field. Our results showed that considering the sliding motion model increased the mass of accreted snow due to the large projected wire area, consistent with the observed result. In addition, the force exerted by airflow on the wires differed significantly with and without the sliding motion model. These findings contribute to a better understanding and estimation of electrical wire galloping.