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The correlation analysis between snow streamers and turbulent wind field

Zhengshi Wang 1 ,2, Ning Huang1 ,2
1Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education of China, Lanzhou, China, 2Department of Mechanics, School of Civil Engineering and Mechanics, Lanzhou, China

The turbulent atmosphere boundary layer is the largest ‘greenhouse' for the diffusion and transport of granular matter on the earth surface, eg. the drifting snow. However, little is known about the turbulent effect of atmosphere boundary layer on scattering snow particles in the air for in current drifting snow models the effects of turbulence are usually not included. In this paper, a modified Large Eddy Simulation (LES) code is used for simulating the turbulent air flow. The coupling effects between wind field and snow particles are taken into account. The drifting snow is produced by both of the aerodynamic entrainment and particle-bed interaction, and the trajectory of every moving snow particle is calculated through Lagrangian Particle Tracking method. The results indicate that the blown snow in the turbulent flow form obvious snow streamers and the structure of turbulent wind field is highly relevancy with the shapes of blown snow.