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    Coherent Structure Variations in the Flow around a Square Pier with an Evolving Scour Hole

    Source: Journal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 004::page 04025009-1
    Author:
    Murali Krishnamraju Kalidindi
    ,
    Rakesh Khosa
    DOI: 10.1061/JHEND8.HYENG-14263
    Publisher: American Society of Civil Engineers
    Abstract: Coherent structures play a significant role in the formation and growth of scour holes around bridge piers. The present study used large eddy simulations (LES) to investigate the variations of coherent structures at different stages of scour hole evolution and the role of their interactions on the scour hole development. The study revealed that the interactions of secondary vortices with the primary horseshoe vortex (PHV) significantly changed the size and shape of the PHV and amplified the pressure fluctuations inside the scour hole. The LES captured bimodal aperiodic oscillations in the PHV. The interactions between the legs of the PHV with the separated shear layers (SSLs) were found to be one of the reasons for the lateral expansion of the scour hole. The separation of shear layers very close to each other near the bed surface significantly amplified the bed shear stress behind the pier and was responsible for the growth of the scour hole in the pier downstream. The formation of a U-shaped elongated vortex was observed downstream of the pier, and it was found to be responsible for the transport of sediment behind the pier. The study also reported variations in coherent structures as the pier shape changes from circular to square. The information reported in the study can be used to improve the scour depth prediction methods.
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      Coherent Structure Variations in the Flow around a Square Pier with an Evolving Scour Hole

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4307461
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    contributor authorMurali Krishnamraju Kalidindi
    contributor authorRakesh Khosa
    date accessioned2025-08-17T22:47:44Z
    date available2025-08-17T22:47:44Z
    date copyright7/1/2025 12:00:00 AM
    date issued2025
    identifier otherJHEND8.HYENG-14263.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307461
    description abstractCoherent structures play a significant role in the formation and growth of scour holes around bridge piers. The present study used large eddy simulations (LES) to investigate the variations of coherent structures at different stages of scour hole evolution and the role of their interactions on the scour hole development. The study revealed that the interactions of secondary vortices with the primary horseshoe vortex (PHV) significantly changed the size and shape of the PHV and amplified the pressure fluctuations inside the scour hole. The LES captured bimodal aperiodic oscillations in the PHV. The interactions between the legs of the PHV with the separated shear layers (SSLs) were found to be one of the reasons for the lateral expansion of the scour hole. The separation of shear layers very close to each other near the bed surface significantly amplified the bed shear stress behind the pier and was responsible for the growth of the scour hole in the pier downstream. The formation of a U-shaped elongated vortex was observed downstream of the pier, and it was found to be responsible for the transport of sediment behind the pier. The study also reported variations in coherent structures as the pier shape changes from circular to square. The information reported in the study can be used to improve the scour depth prediction methods.
    publisherAmerican Society of Civil Engineers
    titleCoherent Structure Variations in the Flow around a Square Pier with an Evolving Scour Hole
    typeJournal Article
    journal volume151
    journal issue4
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/JHEND8.HYENG-14263
    journal fristpage04025009-1
    journal lastpage04025009-15
    page15
    treeJournal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 004
    contenttypeFulltext
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