风沙运动的欧拉双流体模型参数研究

利用数值方法研究了双流体模型中动力黏度μ_s,kin、动量交换系数β和碰撞恢复系数e_ss对风沙运动的影响.结果显示:动力黏度μ_s,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e_ss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.

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

Using the numerical simulation method, the effects of the kinetic viscosity μ_s,kin, the momentum exchange coefficient β and the particle restitution coefficient e_ss of Euler two-phase model on windblown sand movement are analyzed. The results demonstrate that the kinetic viscosity μ_s,kin affects the sand emission rate over sand bed, the momentum exchange coefficient β changes the development of streamwise sand transport rate, and the vertical distribution of sand mass flux varies with the particle restitution coefficient e_ss. 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.