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Influence of the turbulence structure on the particle sedimentation in wall-bounded flows

机译:湍流结构对壁限流颗粒沉积的影响

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In this paper we analyze the influence of the particle Froude number in the settling velocity of particles in wall-bounded turbulence. We consider dilute situations using point-particle direct numerical simulations, neglecting the modifications of the flow by the particles (one-way coupling). We compare our results with the cases of particles settling around a single vortex and a vortex array. The behavior of the settling velocity in the wall-bounded turbulence case is found to be similar to the one of particles settling in a vortex array with a "large" inter-vortex distance. We analyze how the particle settling velocity is related to the particle-fluid two-point velocity correlations.
机译:在本文中,我们分析了颗粒FRoude数在壁限湍流中颗粒沉降速度的影响。我们考虑使用点粒子直接数值模拟稀释情况,忽略颗粒(单向耦合)的流动的修改。我们将我们的结果与围绕单个涡流和涡流阵列沉降的粒子进行比较。发现壁有缠绕湍流壳体中的沉降速度的行为与涡旋阵列中的颗粒之一类似,具有“大”涡流距离。我们分析颗粒稳定速度如何与粒子流体两点速度相关性有何相关。

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