Wake characteristics of wind-sand cylindrical flow under different turbulence intensity

Abstract Wind-sand environment has a great influence on wind turbine performance. In order to further investigate the influence of turbulence on wind turbine wake characteristics in wind-sand environment, the gas-solid two-phase numerical simulation was carried out by using SST k-ω turbulence model and MPPICFoam solver based on OpenFOAM to solve the problem of flow around a cylinder. The variation of aerodynamic load on the cylinder surface of clean flow field and wind-sand flow field under different turbulence is compared, and the frequency of vortex shedding is studied by spectrum analysis. Secondly, the particle distribution and the evolution process of the wind-sand flow field are studied. Finally, different wake velocity sections are selected to analyze the influence of different turbulence intensity on the wake velocity of the wind-sand flow field. The results show that wind-blown sand reduces the frequency of wake vortex shedding, while turbulence increases the frequency of wake vortex shedding and reduces the scale of wake vortex. In addition, the wind-sand flow field accelerates in the far wake region, and the increase of turbulence strengthens this phenomenon.