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DIRECT NUMERICAL SIMULATION OF PARTICLE SALTATION IN TURBULENT CHANNEL FLOW

机译:湍流通道内颗粒盐分的直接数值模拟

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This paper reports on the numerical investigation of particle saltation in a turbulent channel flow having a rough bed consisting of 2-3 layers of densely packed spheres. The Shield's Function is 0.065 which is just above the sediment entrainment threshold to give a bed-load regime. The applied methodology is a combination of three technologies, i.e., the direct numerical simulation of turbulent flow, the combined finite-discrete element modelling of the deformation, movement and collision of the particles, and the immersed boundary method for the fluid-solid interaction. It is shown that the presence of entrained particles significantly modifies the profiles of flow velocity and turbulent intensities in the vicinity of a rough-bed. Statistical features of particle translational and angular velocities, together with sediment concentration and volumetric flux density profiles, are presented.
机译:本文报道了湍流通道中颗粒盐析的数值研究,该湍流具有由2-3层密集堆积的球体组成的粗糙床层。盾构函数为0.065,刚好高于沉积物夹带阈值,以提供床荷状态。应用的方法是三种技术的组合,即湍流的直接数值模拟,颗粒变形,运动和碰撞的组合有限元模型以及用于流固相互作用的沉浸边界方法。结果表明,夹带颗粒的存在显着改变了粗糙床附近的流速和湍流强度分布。介绍了粒子平移和角速度的统计特征,以及沉积物浓度和体积通量密度分布图。

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