Temporal flow instability for Magnus - Robins effect at high rotation rates

Sengupta, TK and Kasliwal, A and De, S and Nair, Manoj T (2003) Temporal flow instability for Magnus - Robins effect at high rotation rates. Journal of Fluids and Structures, 17 (7). pp. 941-953.

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Abstract

The lift and drag coefficients of a circular cylinder, translating and spinning at a supercritical rate is studied theoretically to explain the experimentally observed violation of maximum mean lift coefficient principle, that was proposed heuristically by Prandtl on the basis of inviscid flow model. It is also noted experimentally that flow past a rotating and translating cylinder experiences temporal instability-a fact not corroborated by any theoretical studies so far. In the present paper we report very accurate solution of Navier-Stokes equation that displays the above-mentioned instability and the violation of the maximum limit. The calculated lift coefficient exceeds the limit of 4?, instantaneously as well as in time-averaged sense. The main purpose of the present paper is to explain the observed temporal instability sequence in terms of a new theory of instability based on full Navier-Stokes equation that does not require making any assumption about the flow field, unlike other stability theories. xA9; 2003 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Uncontrolled Keywords: Cylinders (shapes); Drag; Navier Stokes equations; Prandtl number; Stability; Temporal flow; Structural analysis; circular cylinder; drag coefficient; flow around object; flow field; instability; lift (fluid mechanics); Navier-Stokes equations; rotation;
Subjects: AERONAUTICS > Aerodynamics
Division/Department: Other, Other, Other, Computational and Theoretical Fluid Dynamics Division
Depositing User: MS Jayashree S
Date Deposited: 07 Jan 2005
Last Modified: 24 May 2010 09:38
URI: http://nal-ir.nal.res.in/id/eprint/48

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