Temporal flow instability for Magnusx2013;Robins effect at high13; rotation rates

Sengupta, TK and Kasliwala, A and De, S and Nair, Manoj T (2003) Temporal flow instability for Magnusx2013;Robins effect at high13; rotation rates. Journal of Fluids and Structures, 17. 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 studied13; theoretically to explain the experimentally observed violation of maximum mean lift coefficient principle, that was proposed heuristically by Prandtl on the basis of inviscid flowmodel. It is also noted experimentally that flowpast a rotating and translating cylinder experiences temporal instabilityx2014;a fact not corroborated by any theoretical studies so far. In the present paper we report very accurate solution of Navierx2013;Stokes equation that displays the above-mentioned instability and the violation of the maximum limit. The calculated lift coefficient exceeds the limit of 47t; 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 newtheory of instability based on full Navierx2013;Stokes equation that does not require making any assumption about the flowfield, unlike other stability theories.

Item Type: Article
Additional Information: copyright belongs to Elsevier
Uncontrolled Keywords: Temporal Flow;Temporal Flow Instability;Magnusx2013;Robins effect
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Users 20 not found.
Date Deposited: 11 May 2006
Last Modified: 24 Aug 2015 08:05
URI: http://nal-ir.nal.res.in/id/eprint/1400

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