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    Flow hydrodynamics of the mixing layer in consecutive vegetated groyne fields

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    Type
    Article
    Authors
    Xiang, Ke
    Yang, Zhonghua cc
    Wu, Shiqiang
    Gao, Wei cc
    Li, Dan
    Li, Qiong
    KAUST Department
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-06-19
    Online Publication Date
    2020-06-19
    Print Publication Date
    2020-06-01
    Submitted Date
    2020-02-29
    Permanent link to this record
    http://hdl.handle.net/10754/663801
    
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    Abstract
    In recent years, increasing attention has been paid to the ecological role of groyne fields as habitats for aquatic vegetation; however, knowledge on interactions between vegetation and recirculating flow is still lacking, especially vegetation effects on large-scale coherent structures in the mixing layer, which control the mass exchange between the side-cavity and the main channel. In this paper, the hydrodynamics of the mixing layer in straight open channels without sediments in the flow, with consecutive groyne fields, of different vegetation densities, is investigated both experimentally through particle image velocimetry and numerically through large eddy simulation. The results show that the presence of plants rearranges the circulation systems in the groyne field, namely, from double gyres to a single gyre. With an increase in the vegetation density, the exchange coefficient between the cavity and the main channel gradually decreases. Note that the exchange rate is calculated from a newly proposed exchange layer, which is located away from the groyne tip. Based on the analysis of the Kelvin−Helmholtz eddies along the shear layer, a phenomenological model is proposed for the evolution of coherent structures and the variations in flow hydrodynamics associated with these eddies. Compared to the non-vegetation case, the presence of vegetation could suppress the evolution of coherent eddies in the mixing layer, with a consequent effect on the flow hydrodynamics around the interface.
    Citation
    Xiang, K., Yang, Z., Wu, S., Gao, W., Li, D., & Li, Q. (2020). Flow hydrodynamics of the mixing layer in consecutive vegetated groyne fields. Physics of Fluids, 32(6), 065110. doi:10.1063/5.0006317
    Sponsors
    The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos.51679170 and 51879199) and the Major Technology Innovation of Hubei Province (Grant No. 2019ACA154). The authors also thank editors and anonymous reviewers for their helpful comments on this paper.
    Publisher
    AIP Publishing
    Journal
    Physics of Fluids
    DOI
    10.1063/5.0006317
    Additional Links
    http://aip.scitation.org/doi/10.1063/5.0006317
    https://aip.scitation.org/doi/pdf/10.1063/5.0006317
    ae974a485f413a2113503eed53cd6c53
    10.1063/5.0006317
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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