Control of vortex shedding from a circular cylinder using imposed transverse magnetic field

Singha, Sintu and Sinhamahapatra, KP (2011) Control of vortex shedding from a circular cylinder using imposed transverse magnetic field. International Journal of Numerical Methods for Heat & Fluid Flow, 21 (1). pp. 32-45. ISSN 0961-5539

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Abstract

Purpose – The purpose of this paper is to simulate the flow of a conducting fluid past a circular cylinder placed centrally in a channel subjected to an imposed transverse magnetic field to study the effect of a magnetic field on vortex shedding at different Reynolds numbers varying from 50 to 250. Design/methodology/approach – The two-dimensional incompressible laminar viscous flow equations are solved using a second-order implicit unstructured collocated grid finite volume method. Findings – An imposed transverse magnetic field markedly reduces the unsteady lift amplitude indicating a reduction in the strength of the shed vortices. It is observed that the periodic vortex shedding at the higher Reynolds numbers can be completely suppressed if a sufficiently strong magnetic field is imposed. The required magnetic field strength to suppress shedding increases with Reynolds number. The simulation shows that the separated zone behind the cylinder in a steady flow is reduced as the magnetic field strength is increased. Originality/value – In this paper, due attention is given to resolve and study the unsteady cylinder wake and its interaction with the shear-layer on the channel wall in the presence of a magnetic field. A critical value of the Hartmann number for complete suppression of the shedding at a given Reynolds number is found.

Item Type: Journal Article
Uncontrolled Keywords: Laminar flow;Magnetic fields;Simulation;Turbulent flow
Subjects: AERONAUTICS > Aeronautics (General)
ENGINEERING > Fluid Mechanics and Thermodynamics
Division/Department: Computational and Theoretical Fluid Dynamics Division , Other
Depositing User: Ms. Alphones Mary
Date Deposited: 25 Jan 2012 15:55
Last Modified: 25 Jan 2012 15:55
URI: http://nal-ir.nal.res.in/id/eprint/10292

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