A stochastic vortex structure method for interacting particles in turbulent shear flows
A stochastic vortex structure method for interacting particles in turbulent shear flows
复制标题
DOI：
10.1063/1.5007743
复制
发表时间：
2018-01
影响因子：
4.6
通讯作者：
F. F. Dizaji-F.;J. Marshall;J. R. Grant
中科院分区：
文献类型：
--
作者：
F. F. Dizaji-F.;J. Marshall;J. R. Grant
在最近的一项研究中，我们提出了一种新的合成湍流方法的基础上随机涡结构（SVS），我们已经证明，这种方法可以准确地预测粒子的运输，碰撞，并在均匀，各向同性湍流凝聚相比，直接数值模拟结果。本文将SVS方法推广到非均匀各向异性湍流。这种扩展的关键要素是一个新的反演程序，通过它可以设置涡的初始方向，从而产生一个指定的雷诺应力场。在验证了简单问题的反演过程后，我们将SVS方法应用于湍流平面射流相互作用的粒子输运问题。的湍流和颗粒的分散，聚类和碰撞的措施所获得的新的SVS模拟比较以及直接的数值模拟结果。不同数值参数，如涡数和涡寿命的影响。
In a recent study, we have proposed a new synthetic turbulence method based on stochastic vortex structures (SVSs), and we have demonstrated that this method can accurately predict particle transport, collision, and agglomeration in homogeneous, isotropic turbulence in comparison to direct numerical simulation results. The current paper extends the SVS method to non-homogeneous, anisotropic turbulence. The key element of this extension is a new inversion procedure, by which the vortex initial orientation can be set so as to generate a prescribed Reynolds stress field. After validating this inversion procedure for simple problems, we apply the SVS method to the problem of interacting particle transport by a turbulent planar jet. Measures of the turbulent flow and of particle dispersion, clustering, and collision obtained by the new SVS simulations are shown to compare well with direct numerical simulation results. The influence of different numerical parameters, such as number of vortices and vortex lifeti...