Linear Shear Flow Past a Rotating Elliptic CylinderSource: Journal of Fluids Engineering:;2018:;volume( 140 ):;issue: 012::page 121202DOI: 10.1115/1.4040365Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Simulations are carried out for linear shear flow past a rotating elliptic cylinder to investigate the effect of shear flow on hovering vortex. An in-house fluid solver that is based on immersed boundary method (IBM) is used to study the flow features and variation in aerodynamic forces. The simulations are carried out for various nondimensional rotation rates, axis ratio (AR) 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 form, detach, and 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 shows no dependency on shear parameter.
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contributor author | Naik, Sandeep N. | |
contributor author | Vengadesan, S. | |
contributor author | Arul Prakash, K. | |
date accessioned | 2019-02-28T10:59:53Z | |
date available | 2019-02-28T10:59:53Z | |
date copyright | 6/26/2018 12:00:00 AM | |
date issued | 2018 | |
identifier issn | 0098-2202 | |
identifier other | fe_140_12_121202.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4251559 | |
description abstract | Simulations are carried out for linear shear flow past a rotating elliptic cylinder to investigate the effect of shear flow on hovering vortex. An in-house fluid solver that is based on immersed boundary method (IBM) is used to study the flow features and variation in aerodynamic forces. The simulations are carried out for various nondimensional rotation rates, axis ratio (AR) 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 form, detach, and 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 shows no dependency on shear parameter. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Linear Shear Flow Past a Rotating Elliptic Cylinder | |
type | Journal Paper | |
journal volume | 140 | |
journal issue | 12 | |
journal title | Journal of Fluids Engineering | |
identifier doi | 10.1115/1.4040365 | |
journal fristpage | 121202 | |
journal lastpage | 121202-10 | |
tree | Journal of Fluids Engineering:;2018:;volume( 140 ):;issue: 012 | |
contenttype | Fulltext |