LAGRANGIAN FLOW SIMULATION WITH SUB-PARTICLE-SCALE TURBULENCE MODEL
LAGRANGIAN FLOW SIMULATION WITH SUB-PARTICLE-SCALE TURBULENCE MODEL
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亚粒子尺度湍流模型的拉格朗日流动模拟
DOI：
10.2208/prohe.44.575
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Tomoki Shibahara
中科院分区：
文献类型：
--
作者：
H. Gotoh;T. Sakai;Tomoki Shibahara
通过安装亚粒子尺度 (SPS) 湍流模型，扩展了纳维-斯托克斯方程的拉格朗日求解器或 MPS 方法。粒子尺度（PS）流的动量方程是通过纳维-斯托克斯方程的滤波运算导出的。 SPS 湍流的影响在 PS 动量方程中作为雷诺应力项被发现。雷诺应力项是通过引入 Smagorinsky 模型来描述的，该模型在欧拉 LES 中经常使用。 MPS 方法相对于欧拉流计算自由表面流具有优势，因为它不受平流项离散化带来的数值扩散的影响。而本文将基于SPS湍流模型的MPS方法应用于湍流混合层或射流，以展示其在模拟结构简单的湍流中的性能。将平均速度剖面与之前的实验进行比较。射流的非定常行为以及射流与静水界面处的混合过程显示为粒子运动的快照。
A Lagrangian solver of the Navier-Stokes equation, or the MPS method, is extended by installing the sub-particle-scale (SPS) turbulence model. The momentum equation for the particle-scale (PS) flow is derived through the filtering operation of the Navier-Stokes equation. The effect of the SPS turbulence is found as the Reynolds stress terms in the PS momentum equation. The Reynolds stress terms are described by introducing the Smagorinsky model, which is frequently used in Eulerian LES. The MPS method has the advantage in the calculation of the free-surface flow against the Eulerian one, because it is free from the numerical diffusion due to the discretization of advection terms. While, in this paper, the MPS method with the SPS turbulence model is applied to the turbulent mixing layer, or the jet, to show its performance on the simulation of the turbulent flow with a simple structure. The mean velocity profile is compared with the previous experiments. The unsteady behavior of the jet and the mixing process at the interface of the jet and the still water are displayed as the snapshots of the particle motion.
影响因子：
1.2
作者：
Koshizuka, S;Oka, Y
通讯作者：
Oka, Y