Volume 12 Issue 2
Jun.  2019
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Fang-fang Wang, Shi-qiang Wu, Sen-lin Zhu. 2019: Numerical simulation of flow separation over a backward-facing step with high Reynolds number. Water Science and Engineering, 12(2): 145-154. doi: 10.1016/j.wse.2019.05.003
Citation: Fang-fang Wang, Shi-qiang Wu, Sen-lin Zhu. 2019: Numerical simulation of flow separation over a backward-facing step with high Reynolds number. Water Science and Engineering, 12(2): 145-154. doi: 10.1016/j.wse.2019.05.003
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Numerical simulation of flow separation over a backward-facing step with high Reynolds number

doi: 10.1016/j.wse.2019.05.003

  • State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China

Funds:  This work was supported by the National Natural Science Foundation of China (Grant No. 51379128).
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  • Corresponding author: Shi-qiang Wu
  • Received Date: 2018-08-11
  • Rev Recd Date: 2019-02-18
    Abstract
  • Large eddy simulation (LES) explicitly calculates the large-scale vortex field and parameterizes the small-scale vortices. In this study, LES and κ-ε models were developed for a specific geometrical configuration of backward-facing step (BFS). The simulation results were validated with particle image velocimetry (PIV) measurements and direct numerical simulation (DNS). This LES simulation was carried out with a Reynolds number of 9000 in a pressurized water tunnel with an expansion ratio of 2.00. The results indicate that the LES model can reveal large-scale vortex motion although with a larger grid-cell size. However, the LES model tends to overestimate the top wall separation and the Reynolds stress components for the BFS flow simulation without a sufficiently fine grid. Overall, LES is a potential tool for simulating separated flow controlled by large-scale vortices.

     

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