风沙运动的欧拉双流体模型参数研究

Investigation of Parameters in Euler Two-Phase Model for Wind Blow Sand

利用数值方法研究了双流体模型中动力黏度μs,kin、动量交换系数β和碰撞恢复系数ess对风沙运动的影响。结果显示:动力黏度μs,kin影响沙床面起沙率,动量交换系数β影响输沙率沿流程的变化,碰撞恢复系数ess影响输沙量的垂向分布。利用研究得到的参数,模拟风沙流运动,并与已有的诸多实验和数值模拟结果对比,结果吻合较好,说明该参数的选取可以有效地模拟风沙流运动。

Using the numerical simulation method,the effects of the kinetic viscosityμs,kin,the momentum exchange coefficientβand the particle restitution coefficient essof Euler two-phase model on windblown sand movement are analyzed.The results demonstrate that the kinetic viscosityμs,kinaffects the sand emission rate over sand bed,the momentum exchange coefficientβchanges the development of streamwise sand transport rate,and the vertical distribution of sand mass flux varies with the particle restitution coefficient ess.The parameters obtained through numerical simulation are utilized to compute the windblown sand movement.And the characteristics of the windblown sand movement demonstrated by Euler two-phase model are in good accordance with those given in former experiments and numerical simulations.It shows that the parameters are suitable for the simulation of the windblown sand movement.