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首页> 外文期刊>Journal of Fluids Engineering: Transactions of the ASME >Scalar Mixing Study at High-Schmidt Regime in a Turbulent Jet Flow Using Large-Eddy Simulation/Filtered Density Function Approach
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Scalar Mixing Study at High-Schmidt Regime in a Turbulent Jet Flow Using Large-Eddy Simulation/Filtered Density Function Approach

机译：大涡模拟/滤波密度函数法在湍流射流高斯密特状态下的标量混合研究

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摘要

Mixing of a passive scalar in a high-Schmidt turbulent round jet was studied using large-eddy simulation (LES) coupled to filtered density function (FDF). This coupled approach enabled the solution of the continuity, momentum, and scalar (concentration) transport equations when studying mixing in a confined turbulent liquid jet discharging a conserved scalar (rhodamine B) into a low-velocity water stream. The Monte Carlo method was used for solving the FDF transport equation and controlling the number of particles per cell (NPC) using a clustering and splitting algorithm. A sensibility analysis of the number of stochastic particles per cell as well as the influence of the subgrid-scale (SGS) mixing time constant were evaluated. The comparison of simulation results with experiments showed that LES/FDF satisfactorily reproduced the behavior observed in this flow configuration. At high radial distances, the developed superviscous layer generates an intermittency phenomenon leading to a complex, anisotropic behavior of the scalar field, which is difficult to simulate with the conventional and advanced SGS models required by LES. This work showed a close agreement with reported experimental data at this superviscous layer following the FDF approach.
机译：使用耦合过滤密度函数（FDF）的大涡模拟（LES）研究了高施密特湍流圆形射流中无源标量的混合。当研究将湍流中的纯净标量（若丹明B）排放到低速水流中的受限湍流喷流中的混合时，这种耦合方法可以求解连续性，动量和标量（浓度）传输方程。蒙特卡罗方法用于求解FDF输运方程，并使用聚类和分裂算法控制每个单元的粒子数（NPC）。评估了每个细胞中随机颗粒数的敏感性分析以及亚网格规模（SGS）混合时间常数的影响。仿真结果与实验结果的比较表明，LES / FDF令人满意地重现了在此流动配置中观察到的行为。在高径向距离处，发达的超粘层会产生间歇性现象，导致标量场的复杂各向异性行为，这很难用LES所需的常规和高级SGS模型进行模拟。这项工作表明，遵循FDF方法，在该超粘层上报告的实验数据非常一致。

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