Investigation of Lift Crisis Phenomenon in Flow Over a Rotating Cylinder at Reynolds Numbers 60,000 and 140,000 Using a Transition Model

Athkuri, Sai Saketha Chandra and R, Aswin and Nived, M. R. and Eswaran, Vinayak (2022) Investigation of Lift Crisis Phenomenon in Flow Over a Rotating Cylinder at Reynolds Numbers 60,000 and 140,000 Using a Transition Model. In: AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022, 3 January 2022 through 7 January 2022, San Diego.

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Laminar-turbulent transition plays an essential role in determining the flow characteristics of a bluff body. In flow past a rotating cylinder, for Reynolds number (Re) greater than 35k, the boundary layer on the counter-flow side of the cylinder undergoes a laminar-turbulent transition. This results in a lift crisis, i.e., a regime of decreased lift, for a narrow band of non-dimensionless rotation speeds. For Re 60k, a decline in lift coefficient is observed at = 0.48 and continues to decline till = 0.6, after which it increases monotonically. For Re 140k, the experiments suggest the decline just after = 0 that continues till = 0.2. In this paper, this phenomenon is studied for Re 60k and 140k with the Spalart-Allmaras (SA)-BCM transition model for dimensionless rotation speeds varying from 0 to 2. It is found that the results of the transition model are qualitatively comparable with the experiments for both Reynolds numbers. For Re 60k, the transition model predicted the experiment better than LES until the onset of lift crisis, but failed to predict the lift crisis. For Re 140k, the SA-BCM predicted values better than LES. In all cases the transition SA-BCM model predicted values better than the SA model, thereby underscoring the importance of the laminar-turbulent boundary layer transition on the drag and lift computations of bluff bodies. © 2022, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

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IITH Creators:
IITH CreatorsORCiD
Eswaran, VinayakUNSPECIFIED
Item Type: Conference or Workshop Item (Paper)
Additional Information: The first author is supported by the core research grant no. CRG/2020/000901 of the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India. The fellowship assistance provided by the Department of Higher Education, Ministry of Human Resource Development, Government of India, is gratefully acknowledged by the second author. The third author is funded by the Research Scholar Program (RSP) of Tata Consultancy Services (TCS) Cycle ’16.
Uncontrolled Keywords: Bluff body; Counterflow; Flow characteristic; Laminar-turbulent transition; Narrow bands; Reynold number; Rotating cylinders; Rotation speed; Spalart-Allmaras; Transition model
Subjects: Physics > Mechanical and aerospace
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 26 Jul 2022 11:43
Last Modified: 26 Jul 2022 11:43
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