Hydrodynamics and turbulence anisotropy for complex flow in a sinuous channel

Taye, Jyotismita; Kumar, Bimlesh

doi:10.1007/s11600-022-00847-y

Artykuł - szczegóły

Tytuł artykułu

Hydrodynamics and turbulence anisotropy for complex flow in a sinuous channel

Autorzy

Taye Jyotismita , Kumar Bimlesh

Wybrane pełne teksty z tego czasopisma

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

Identyfikatory

DOI

10.1007/s11600-022-00847-y

Warianty tytułu

Języki publikacji

Abstrakty

Sinuous channel flows are the most natural form of alluvial streams. The complex flow in the channel bends has been the main focus of the study. This paper examines the flow velocity and the three-dimensional velocity fluctuations in a pure sinuous channel. The main focus of the study is on the characterization of turbulence anisotropy along the sinuous bend. Experiments were conducted in a sinuous channel of a rectangular cross-section to identify the turbulence present in the flow. Secondary flow, Reynolds shear stress, turbulent kinetic energy, and anisotropy turbulence were evaluated in the sinuous bend. The bend apex is composed of a large circulation cell at the center of the bend section. The maximum Reynolds shear stress (RSS) is located at the bend apex with the streamwise-transverse and transverse-vertical components of RSS showing high peaks of positive and negative values. This fact is in support of the secondary flow observed in this study. Anisotropic stress tensors were estimated at different bend sections and are shown to have greater contribution toward streamwise and transverse direction. Anisotropic invariant map (AIM) identified the turbulence at bend sections and varying flow depth. Two dimensional, cigar-shaped, and pancake-shaped turbulence was observed at the bend upstream and downstream. Isotropic turbulence was observed at the bend apex. Near the bed (z∕h ≤ 0.2) and away from the bed (z∕h ≥ 0.4), pancake-shaped and cigar-shaped turbulence was observed.

Słowa kluczowe

secondary flow anisotropy turbulence anisotropic invariant map sinuous channel

przepływ wtórny anizotropia turbulencja

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2022

Tom

Vol. 70, no 5

Strony

2269--2282

Opis fizyczny

Bibliogr. 50 poz.

Twórcy

autor

Taye Jyotismita

tayejyotismita@gmail.com

Department of Civil Engineering, Indian Institute of Technology, Guwahati 781039, India

https://orcid.org/0000-0002-2730-3824

autor

Kumar Bimlesh

bimk@iitg.ac.in

Department of Civil Engineering, Indian Institute of Technology, Guwahati 781039, India

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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).

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-35c235b8-4abe-4f81-bb96-9647791ae20f