Abstract

This study examined the accuracy of a Lagrangian scheme for simulating both the motion and wall impaction of neutrally buoyant inertial spheres (8.85 $\le$ St $\le$ 18.04) moving in the subcritical regime (Re = 10,972 and 22,366) of flows past a circular cylinder. The accuracy of the eddy-resolving simulations of the flow field was verified based on available data at nearly comparable flow conditions. The accuracy of the particle tracking scheme was verified with respect to corresponding experimental data in a laboratory flume. Particle dispersion en route to the circular cylinder is mostly driven by the flow disturbance from the particle injector tube. The trends in collision rates are largely explained by the rate of particle entertainment into the boundary layer around the cylinder and the inertial condition of the spheres in this proximity region—both of which can be better assessed by post-processing of the numerical outcomes. The primary incentive to undertake this work was the need for validating a particle-based method for quantifying the hydraulic stressors leading to bodily damage of fish passing flows influenced by hydraulic infrastructure.

摘要

本研究检验了模拟中性浮力惯性球的运动和壁面碰撞的拉格朗日方案的准确性（8.85 $\le$ 英石 $\le$18.04）在亚临界状态（Re = 10,972 和 22,366）中流过圆柱体。基于几乎可比流动条件下的可用数据，验证了流场涡流解析模拟的准确性。粒子跟踪方案的准确性通过实验室水槽中的相应实验数据进行了验证。前往圆柱体的颗粒分散主要由来自颗粒喷射管的流动扰动驱动。碰撞率的趋势在很大程度上可以通过粒子进入圆柱体周围边界层的速度和该邻近区域中球体的惯性条件来解释——这两者都可以通过数值结果的后处理来更好地评估。