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Numerical investigation of quasi-periodic flow and vortex structure in a twin rectangular subchannel geometry using detached eddy simulation

机译：基于分离涡模拟的双矩形子通道几何准周期流动和涡结构的数值研究

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摘要

The hybrid Unsteady Reynolds-Averaged Navier-Stokes (URANS)/Large Eddy Simulation (LES) methodology was used to investigate the flow dynamics and associated gap vortex structure in compound rectangular channels for isothermal flows. The specific form of the hybrid URANS/LES approach that was used is the Strelets (2001) version of the Shear Stress Transport (SST) based Detached Eddy Simulation (DES). The DES-SST model was used to study quasi-periodic flow across a gap connecting two rectangular sub-channels on which extensive experiments were conducted by Meyer and Rehme (1994). It was found that the DES-SST model was successful in predicting the characteristics of the flow field in the vicinity of the gap region. The span-wise velocity contours, velocity vector plots, and time traces of the velocity components showed the expected cross flow mixing between the sub-channels through the gap. The dynamics of the flow field were quantitatively described through temporal auto-correlations, spatial cross-correlations and power spectral functions. The numerical predictions were in general agreement with the experiments. Predictions from the model were used to identify different flow mixing patterns. As expected, the simulation predicted the formation of a gap vortex street which results in a quasi-periodic flow through the gap. Coherent structures were identified in the flow field to be comprised of eddies, shear zones and streams. Eddy structures with high vorticity and low pressure cores were found to exist near the vicinity of the gap edge region. A three dimensional vorticity field was identified and found to exist near the gap edge region. The instability mechanism and the probable cause behind the quasi-periodic fluid flow across the gap was identified and related to the inflectional stream-wise velocity profile.
机译：采用非稳态雷诺平均纳维-斯托克斯（URANS）/大涡模拟（LES）混合方法研究了等温复合矩形通道中的流动动力学和相关的间隙涡结构。所使用的URANS / LES混合方法的具体形式是Strelets（2001）版本的基于剪切应力传递（SST）的分离涡流模拟（DES）。 DES-SST模型用于研究连接两个矩形子通道的间隙上的准周期流动，Meyer和Rehme（1994）在其上进行了广泛的实验。发现DES-SST模型成功地预测了间隙区域附近的流场特征。速度分量的跨度速度等值线，速度矢量图和时间轨迹显示了通过间隙的子通道之间的预期横流混合。通过时间自相关，空间互相关和功率谱函数来定量描述流场的动力学。数值预测与实验基本一致。该模型的预测用于识别不同的流动混合模式。如预期的那样，模拟预测将形成间隙涡街，从而导致准周期性流过该间隙。在流场中确定了相干结构，该结构由涡流，剪切区和流组成。发现在间隙边缘区域附近存在具有高涡度和低压芯的涡结构。确定了三维涡流场，发现其存在于间隙边缘区域附近。识别了通过间隙的准周期流体流动背后的不稳定性机理和可能原因，并与弯曲流速度曲线有关。

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  • 来源
    《Nuclear Engineering and Design》 |2014年第4期|1-20|共20页
  • 作者

    D. Home; M.F. Lightstone;

  • 作者单位

    McMaster University, Department of Mechanical Engineering, Hamilton, Ontario, Canada L8S 4L7;

    McMaster University, Department of Mechanical Engineering, Hamilton, Ontario, Canada L8S 4L7;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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