Numerical simulation study of particle collection processes on isolated obstacle surfaces near the ground surface

In this study, the effects of turbulence around obstacles are considered to improve an existing numerical model for simulating aerosol particle deposition in rough surface environments. The modified numerical model is validated through wind tunnel experiments. Subsequently, the particle collection process on an isolated cylindrical obstacle placed on the ground is investigated using numerical simulations. The effects of different wind conditions, particle properties, and obstacle sizes on the collection process are analyzed. Finally, a fitted relationship between the Stokes number and collection efficiency is proposed.

本研究针对粗糙表面环境下气溶胶粒子沉积的数值模拟现有模型进行优化，将障碍物周围的湍流效应纳入考量。通过风洞实验对改进后的数值模型开展验证工作。随后，借助数值模拟手段，对置于地面的孤立圆柱障碍物表面的粒子捕集过程展开研究。分析了不同风况条件、粒子物理特性以及障碍物尺寸对该捕集过程的影响。最终，提出了斯托克斯数（Stokes number）与粒子捕集效率之间的拟合关联式。