【摘要】 本文针对沙尘暴天气的风沙气固两相流 ,采用 FLUENT软件 ,对风沙运动进行了 2 D数值模拟分析 ,比较了流体边界条件对流场的影响。本文提出一个新的沙粒起动体积浓度的表达式 ;并在计算中作为边界条件。计算结果揭示了风沙运动中沙尘的体积浓度分布及其在粒径变化及风速变化影响下的变化规律更多还原

【Abstract】 This paper presents the two-dimensional numerical simulation of dust transport by wind, which makes use of the software FLUENT according to the feature of sand-dust storm — gas-solid two-phase flow. At the same time, the influence of flow boundary condition is analyzed. This paper develops a new volume concentration expression of jump-starting sand, which is also as the boundary condition in the course of simulation. The simulating results, such as the distributions of sand volume concentration, bring the behavior of gas-solid two-phase flow to light. At the same time, show out the alteration regulars of sand volume concentration under the effects of particle size and wind velocity.更多还原