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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2018020767
pages 531-552

EFFECT OF HEIGHT RATIO ON WAKE TRANSITION IN UNSTEADY FLOW PAST ISOSCELES TRAPEZOIDAL CYLINDER

G. Raghu Vamsee
Department of Mechanical Engineering, Indian Institute of Technology Madras Chennai, India, 600036
Shaligram Tiwari
Department of Mechanical Engineering, Indian Institute of Technology Madras Chennai, India, 600036
Thirumalachari Sundararajan
Thermodynamics and Combustion Engineering Laboratory Department of Mechanical Engineering Indian Institute of Technology Madras, Chennai – 600036, India
V. Raghavan
Department of Mechanical Engineering, Indian Institute of Technology Madras Chennai, India, 600036

RÉSUMÉ

Two-dimensional numerical investigations are carried out on flow past a trapezoidal cylinder confined in a channel by using an indigenously developed finite difference-based flow solver. The solver uses body-fitting coordinate transformation and the marker and cell (MAC) algorithm. Laminar flow of air has been considered past the cylinder of varying height ratio (HR) from 0.2 to 1.0 over a range of Reynolds numbers (Re) from 60 to 200. Effects of HR and Re have been studied on wake and dynamic characteristics for two different orientations of the isosceles trapezoidal cylinder, viz., base facing and apex facing. Critical value of Re for onset of vortex shedding has been identified for both the configurations. Results from the present work illustrate how separation behavior gets modified with change in Re and HR. Also the work aims to find such values of HR that are associated with minimum drag and cause maximum delay in the onset of vortex shedding.


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