1. 根据Reynolds润滑理论，采用小参数法，导出了存在填隙二阶流体时，圆球沿平行于乎壁缓慢移动时流体的速度场和压力方程，进而求出切向阻力和阻力矩的解析解。
Based on the Reynolds'lubrication approximation and utilizing the Perturbation method, the velocity and the pressure equations for a sphere translating parallel to a wall with an interstitial second order fluid was derived for modeling wet granular assembles using Discrete Element Method.