【摘要】 通过对描述沙粒垂向运动速度脉动分量的随机微分方程的直接求解,获得了风沙流中沙粒运动的随机轨迹。结果表明,由于沙粒垂向脉动速度的影响,沙粒的轨迹与不考虑其垂向脉动速度的情形存在明显不同。在此基础上,通过对大量轨迹的统计计算,得到了沙粒浓度的分布规律。更多还原

【Abstract】 Stochastic sand trajectories in wind-blown sand were obtained by solving the differential equation which describes the vertical fluctuating velocity of sand grains.The results show that because of the effect of account of vertical fluctuating velocity,the trajectories of sand grain involving the effect are differ obviously from that not involving the effect.And then,the concentration profiles were presented based on statistical analysis of ensemble of such stochastic trajectories.更多还原