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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Effects of deterministic and stochastic forcing schemes on the relative motion of inertial particles in DNS of isotropic turbulence
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Effects of deterministic and stochastic forcing schemes on the relative motion of inertial particles in DNS of isotropic turbulence

机译：确定性和随机迫使方案对各向同性湍流DNS惯性颗粒相对运动的影响

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摘要

In direct numerical simulations (DNS) of homogeneous isotropic turbulence, statistical stationarity is achieved by artificially forcing the low-wavenumber scales of turbulence. In this study, the effects of two such forcing schemes on the relative positions and velocities of heavy, monodisperse, "point" particles in isotropic turbulence are studied. The first forcing scheme considered is a deterministic method that maintains the turbulent kinetic energy constant by resupplying the energy dissipated during a time step to the velocity components in a low-wavenumber band. The second is the stochastic forcing scheme of Eswaran and Pope [Comput. Fluids 16, 257 (1988)] that involves adding a forcing acceleration to the fluid momentum equation at the low wavenumbers. The forcing acceleration is based on a combination of six independent Uhlenbeck-Ornstein (UO) random processes. An input parameter to the stochastic scheme is the correlation time scale T-f of the UO processes. Among our objectives is to assess the effects of varying T-f on the relative-motion statistics of inertial particle pairs.
机译：在均匀各向同性湍流的直接数值模拟（DNS）中，通过人工强迫湍流的低波数尺度来实现统计适应性。在这项研究中，研究了两种这种迫使方案对各向同性湍流中重，单分散，“点”颗粒的相对位置和速度的影响。所考虑的第一强制方案是一种确定性方法，其通过将湍流动能常数重新加以在低波数带中的速度分量的时间步骤中散发而重新渗透来维持湍流动能常数。第二是Eswaran和Pope的随机迫使方案[计算。流体16,257（1988），其涉及将迫使加速加速到低波兰位的流体动量方程。强制加速基于六个独立的Uhlenbeck-Ornstein（UO）随机过程的组合。到随机方案的输入参数是UO进程的相关时间尺度T-F。在我们的目标是评估不同T-F对惯性粒子对的相对运动统计的影响。

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