A correction scheme for wall-bounded two-way coupled point-particle simulations
A correction scheme for wall-bounded two-way coupled point-particle simulations
复制标题
壁面双向耦合点粒子模拟的修正方案
DOI：
10.1016/j.jcp.2020.109711
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发表时间：
2020
影响因子：
4.1
通讯作者：
Apte, Sourabh V.
中科院分区：
文献类型：
--
作者：
Pakseresht, Pedram;Esmaily, Mahdi;Apte, Sourabh V.
欧拉-拉格朗日点-质点模型在含颗粒流体流动模拟中的精度取决于通过闭合模型对质点作用力的准确估计。典型的力封闭模型需要计算颗粒位置的滑移速度，这反过来又需要准确地估计不受干扰的流体速度。当流体和颗粒相双向耦合时，由于颗粒在附近流体速度场中的作用力所产生的扰动，这种不受扰动的速度很难获得。一种常见的做法是使用扰动速度来计算质点作用力，这可能导致预测粒子动力学的误差高达100%。在这项工作中，提出了一种修正方案，便于准确估计有无防滑壁的颗粒流体流动中的无扰动流体速度。该模型是通用的，可以处理不同大小和密度的粒子、任意内插和投影函数、具有大长宽比的各向异性网格以及壁面边界流动。目前的修正方案是由Esmaly&Horwitz(JCP，2018)最近关于无界颗粒流的工作所推动的。对壁面有界流动进行了必要的修正，从而精确地恢复了任意壁面距离处的无扰动流体速度，渐近地接近于远离壁面的颗粒的无界格式的结果。对颗粒在防滑壁上平行和垂直运动时的沉降速度进行了详细的验证试验。详细考虑了一系列的流动参数和网格结构，包括各向异性的直线型网格和高宽比的网格，这些网格通常在含颗粒的槽道湍流中遇到。在考虑了壁面效应的情况下，与无界修正方案相比，该修正方案将预测近壁粒子运动的误差减小了一个数量级。
The accuracy of Euler-Lagrange point-particle models employed in particle-laden fluid flow simulations depends on accurate estimation of the particle force through closure models. Typical force closure models require computation of the slip velocity at the particle location, which in turn requires accurate estimation of theundisturbedfluid velocity. Such an undisturbed velocity is not readily available when the fluid and particle phases are two-way coupled, due to the disturbance created by the particle's force in the nearby fluid velocity field. A common practice is to use thedisturbedvelocity to compute the particle force which can result in errors as much as 100% in predicting the particle dynamics. In this work, a correction scheme is developed that facilitates accurate estimation of the undisturbed fluid velocity in particle-laden fluid flows with and without no-slip walls. The model is generic and can handle particles of different size and density, arbitrary interpolation and projection functions, anisotropic grids with large aspect ratios, and wall-bounded flows. The present correction scheme is motivated by the recent work of Esmaily & Horwitz (JCP, 2018) on unbounded particle-laden flows. Modifications necessary for wall-bounded flows are developed such that the undisturbed fluid velocity at any wall distance is accurately recovered, asymptotically approaching the result of unbounded schemes for particles far away from walls. A detailed series of verification tests was conducted on settling velocity of a particle in parallel and perpendicular motions to a no-slip wall. A range of flow parameters and grid configurations; involving anisotropic rectilinear grids with aspect ratios typically encountered in particle-laden turbulent channel flows was considered in detail. When the wall effects are accounted for, the present correction scheme reduces the errors in predicting the near-wall particle motion by one order of magnitude smaller values compared to the unbounded correction schemes.
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影响因子：
2.2
作者：
Mueller, Kathrin;Fedosov, Dmitry A.;Gompper, Gerhard
通讯作者：
Gompper, Gerhard
DOI：
10.1017/s0305004100049902
发表时间：
1971-01-01
期刊：
PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY-MATHEMATICAL AND PHYSICAL SCIENCES
影响因子：
--
作者：
BLAKE, JR
通讯作者：
BLAKE, JR
论DNS-DEM对悬浮沉积物-湍流相互作用的预测能力
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
P. Pakseresht;S. Apte;J. Finn
通讯作者：
J. Finn
欧拉-拉格朗日点粒子模拟中相间传热的自感温度修正
影响因子：
4.1
作者：
Kai Liu;Mandar Lakhote;S. Balachandar
通讯作者：
S. Balachandar
影响因子：
3.7
作者：
Righetti, M;Romano, GP
通讯作者：
Romano, GP