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research-article

Linear shear flow past a rotating elliptic cylinder

[+] Author and Article Information
Sandeep Naik

Fluid Mechanics Laboratory, Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India 600036
naiksandeep.91@gmail.com

S Vengadesan

Professor, Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India 600036
vengades@iitm.ac.in

K. Arul Prakash

Associate Professor, Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India 600036
arulk@iitm.ac.in

1Corresponding author.

ASME doi:10.1115/1.4040365 History: Received October 03, 2017; Revised May 18, 2018

Abstract

Simulations are carried out for linear shear flow past a rotating elliptic cylinder to investigate the effect of hovering vortex. An in-house fluid solver that uses Immersed boundary method is used to study the flow features and variation in aerodynamic forces. The simulations are carried out for varied non-dimensional rotation rates, axis ratio of the cylinder and Shear parameter. In shear flow past rotating elliptic cylinder, the negative vortices are sustained for longer distances in the downstream of the cylinder and due to the velocity gradient, the sequence of the vortex street changes. It also has significant effect on the formation and composition of hovering vortex. To capture these features, each vortex is tracked as they move in the wake of the cylinder. Hovering vortex, formed due to coalescing of multiple vortices near the cylinder, is subdued for smaller rotation rates at moderate shear. It is also observed that lift forces increase linearly with shear while the frequency of shedding show no dependency on shear parameter.

Copyright (c) 2018 by ASME
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