Volume 15 Issue 3
Aug.  2022
Turn off MathJax
Article Contents
Shao-wei Ding, Cheng Zeng, Jie Zhou, Ling-ling Wang, Chen Chen. 2022: Impact of depth ratio on flow structure and turbulence characteristics of compound open channel flows. Water Science and Engineering, 15(3): 265-272. doi: 10.1016/j.wse.2021.12.004
Citation: Shao-wei Ding, Cheng Zeng, Jie Zhou, Ling-ling Wang, Chen Chen. 2022: Impact of depth ratio on flow structure and turbulence characteristics of compound open channel flows. Water Science and Engineering, 15(3): 265-272. doi: 10.1016/j.wse.2021.12.004

Impact of depth ratio on flow structure and turbulence characteristics of compound open channel flows

doi: 10.1016/j.wse.2021.12.004
Funds:

This work was supported by the Fundamental Research Funds for the Central Universities (Grants No. B200202116 and B200204044), the National Natural Science Foundation of China (Grant No. 51879086), and the 111 Project from the Ministry of Education and State Administration of Foreign Expert Affairs of China (Grant No. B17015).

  • Received Date: 2020-09-25
  • Accepted Date: 2021-01-14
  • Rev Recd Date: 2021-01-14
  • Available Online: 2022-08-24
  • Compound open channel flows appear in most natural rivers are of great importance in river management and flood control. In this study, large eddy simulations were carried out to simulate the compound open channel flows with four different depth ratios (hr = 0.10, 0.25, 0.50, and 0.75). The main flow velocity, secondary flow, Reynolds stress, and bed shear stress were obtained from numerical simulations. The depth-averaged streamwise momentum equation was used to quantify the lateral momentum exchange between the main channel and floodplain. The instantaneous coherent structures were presented by the Q criterion method. The impact of hr on flow structure and turbulence characteristics was analyzed. The results showed that with the increase of hr, the high velocity area in the main channel shifted to the floodplain, and the dip phenomenon became more obvious; the Reynolds stress largely contributed to the lateral momentum exchange within the flows near the side walls of floodplain; and the vortex structures were found to significantly increase in the floodplain region.

     

  • loading
  • [1]
    Chen, Y., Ji, C.N., Xu, D., 2017. Three-dimensional direct numerical simulation of compound open channel flows. Port Engineering Technology 29(6), 1638-1649 (in Chinese)
    [2]
    Fu, W.S., Lai, Y.C., Li, C.G., 2013. Estimation of turbulent natural convection in horizontal parallel plates by the Q criterion. International Communications in Heat and Mass Transfer 45, 41-46. https://doi.org/10.1016/j.icheatmasstransfer.2013.04.001
    [3]
    Herrera, J., Cornejo, P., Sepulveda, H.H., Artal, O., Quinones, R.A., 2018. A novel approach to assess the hydrodynamic effects of a salmon farm in a Patagonian channel: Coupling between regional ocean modeling and high resolution les simulation. Aquaculture 495, 115-129. https://doi.org/10.1016/j.aquaculture.2018.05.003
    [4]
    Hunt, J.C.R., Wray, A.A., Moin, P., 1988. Eddies, stream, and convergence zones in turbulent flows. In: Proceedings of the 1988 Summer Program. Stanford University, California, pp.193-208
    [5]
    Kara, S., Stoesser, T., Sturm, T.W., 2012. Turbulence statistics in compound channels with deep and shallow overbank flows. Journal of Hydraulic Research 50(5), 482-493. https://doi.org/10.1080/00221686.2012.724194
    [6]
    Liang, A.G., Huai, W.X., 2008. Numerical simulation of secondary flow in compound open channel. Journal of Basic Science and Engineering 16(2), 296-304 (in Chinese)
    [7]
    Liu, C.Q., Wang, Y.Q., Yang, Y., Duan, Z.W., 2016. New omega vortex identification method. Science China Physics, Mechanics & Astronomy 59(8), 684711. https://doi.org/10.1007/s11433-016-0022-6
    [8]
    Lü, B., Wei, W.L., Liu, Y.L., 2012. 3D numerical simulation for hydraulic characteristics of compound section of open channel. Journal of Water Resources and Water Engineering 23(5), 71-73 (in Chinese)
    [9]
    Naot, D., Nezu, I., Nakagawa, H., 1993. Hydrodynamic behavior of compound rectangular open channels. Journal of Hydraulic Engineering. 119(3), 390-408. https://doi.org/10.1061/(ASCE)0733-9429(1993)119:3(390)
    [10]
    Proust, S., Nikora, V.I., 2020. Compound open-channel flows: Effects of transverse currents on the flow structure. Journal of Fluid Mechanics 885, A24. https://doi.org/10.1017/jfm.2019.973
    [11]
    Singh, P.K., Tang, X., Rahimi, H.A., 2020. Computational study of interaction of main channel and floodplain: Open channel flows. Journal of Applied Mathematics and Physics 8, 2526-2539. https://doi.org/10.4236/jamp.2020.811188
    [12]
    Sofialidis, D., Prinos, P., 1999. Numerical study of momentum exchange in compound open channel flow. Journal of Hydraulic Engineering 125(2), 152-165. https://doi.org/10.1061/(ASCE)0733-9429(1999)125:2(152)
    [13]
    Thomas, T.G., Williams, J.J.R., 1995. Large eddy simulation of turbulent flow in an asymmetric compound channel. Hydraulic Research 33(1), 27-41. https://doi.org/10.1080/00221689509498682
    [14]
    Tominaga, A., Nezu, I., 1991. Turbulent structure in compound open-channel flows. Journal of Hydraulic Engineering 117(1), 21-41. https://doi.org/10.1061/(ASCE)0733-9429(1991)117:1(21)
    [15]
    Wang, F.F., Wu, S.Q., Zhu, S.L., 2019. Numerical simulation of flow separation over a backward-facing step with high Reynolds number. Water Science and Engineering 12(2), 145-154. https://doi.org/10.1016/j.wse.2019.05.003
    [16]
    Xie, Z.H., Lin, B.L., Falconer, R.A., 2013. Large-eddy simulation of the turbulent structure in compound open-channel flows. Advances in Water Resources 53(3), 66-75. https://doi.org/10.1016/j.advwatres.2012.10.009
    [17]
    Xu, D., Zhang, B.C., Xu, B., Bai, Y.C., Ji, C.N., 2020. Investigation on the influence of floodplains depth and Reynolds number on the turbulence structure of flow in compound open-channels using large eddy simulation. Chinese Journal of Hydrodynamics 35(1), 74-83 (in Chinese). https://doi.org/10.16076/j.cnki.cjhd.2020.01.012
    [18]
    Zeng, C., Ding, S.W., Zhou, J., Wang, L.L., Chen, C., 2020. A three-dimensional numerical simulation based on WMLES for compound open-channel turbulent flows. Advances in Science and Technology of Water Resources 40(6), 17-22 (in Chinese). https://doi.org/10.3880/j.issn.1006-7647.2020.06.004
    [19]
    Zhang, C.Y., 2005. Experimental study on the characteristics of Reynolds stress in open channel flow. Ph. D. Dissertation. Wuhan University, Wuhan (in Chinese)
    [20]
    Zhang, M.L., Shen, Y.M., Wu, X.G., Zheng, Y.H., 2006. 3-D numerical simulation on overbank flows in compound channels. Journal of Hydroelectric Engineering 25(5), 31-36 (in Chinese). https://doi.org/10.1061/(ASCE)0887-381X(2006)20:1(20)
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Figures(1)

    Article Metrics

    Article views (39) PDF downloads(0) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return