Coherent structures around submerged circular and square cylinders due to change of orientation angle in steady current over plane bed

Bauri, Krishna Pada

doi:10.1007/s11600-022-00799-3

Artykuł - szczegóły

Tytuł artykułu

Coherent structures around submerged circular and square cylinders due to change of orientation angle in steady current over plane bed

Autorzy

Bauri Krishna Pada

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-022-00799-3

Warianty tytułu

Języki publikacji

Abstrakty

The investigation of the bursting process and coherent structures around circular and square cylindrical structures for various angular alignments over a rigid plane bed are introduced. The coherent structures and shear stresses perform a substantial characteristic in bed particle entrainment and transport from the bed around these structures. Hence, bed shear stress, power spectra are determined from the measured velocity data, in addition, third-order correlation, turbulence intensity, and kinetic energy were investigated using quadrant analysis to explore the correlation between coherent structures and sediment movement. Turbulent coherent structures due to the variations of submergence depth, velocity, orientation angle of the square cylinder, and cylinder size are also investigated. Further, the measured velocity data using Acoustic Doppler Velocimeter were validated with numerical simulations using COMSOL Multiphysics 5.0 with k-ω turbulence closure model. Outcomes indicate that the wake zone length rises with the rise of submergence ratio for the square cylinder with different angular alignments than the circular and square cylindrical structures. Bed shear stress is higher for the square cylinder with different angular alignments than the circular cylinder. The wake vortex strength increases with angular alignment signifying excessive movement of bed sediments from the bed around the cylindrical structures. The interaction events predominate near the bed and middle height of the cylinder, whereas ejection and sweep events dominate far away from the bottom toward the top of the cylinders. The stress fraction is maximum for square cylinders with higher alignment angles.

Słowa kluczowe

orientation angle quadrant analysis coherent structures bursting events bed shear stress

kąt orientacji analiza kwadrantowa struktury koherentne

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2022

Tom

Vol. 70, no 5

Strony

2223--2250

Opis fizyczny

Bibliogr. 81 poz.

Twórcy

autor

Bauri Krishna Pada

kb13@iitbbs.ac.in

Department of Civil Engineering, C.V. Raman Global University, Bhubaneswar, Odisha, India
School of Infrastructure, Indian Institute of Technology Bhubaneswar, Bhubaneswar, Odisha, India

https://orcid.org/0000-0001-6032-8620

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).

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Bibliografia

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