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Linear global instability of non-orthogonal incompressible swept attachment-line boundary-layer flow

Published online by Cambridge University Press:  23 August 2012

José Miguel Pérez ,
Daniel Rodríguez  and
Vassilis Theofilis
José Miguel Pérez*
Affiliation:
School of Aeronautics, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros 3, E-28040 Madrid, Spain
Daniel Rodríguez
Affiliation:
School of Aeronautics, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros 3, E-28040 Madrid, Spain Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA 91125, USA
Vassilis Theofilis
Affiliation:
School of Aeronautics, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros 3, E-28040 Madrid, Spain
*
†Email address for correspondence: jomipp@torroja.dmt.upm.es
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Abstract

Flow instability in the non-orthogonal swept attachment-line boundary layer is addressed in a linear analysis framework via solution of the pertinent global (BiGlobal) partial differential equation (PDE)-based eigenvalue problem. Subsequently, a simple extension of the extended Görtler–Hämmerlin ordinary differential equation (ODE)-based polynomial model proposed by Theofilis et al. (2003) for orthogonal flow, which includes previous models as special cases and recovers global instability analysis results, is presented for non-orthogonal flow. Direct numerical simulations have been used to verify the analysis results and unravel the limits of validity of the basic flow model analysed. The effect of the angle of attack, , on the critical conditions of the non-orthogonal problem has been documented; an increase of the angle of attack, from (orthogonal flow) up to values close to which make the assumptions under which the basic flow is derived questionable, is found to systematically destabilize the flow. The critical conditions of non-orthogonal flows at are shown to be recoverable from those of orthogonal flow, via a simple algebraic transformation involving .

Type
Papers
Information
Journal of Fluid Mechanics , Volume 710 , 10 November 2012 , pp. 131 - 153
Copyright
Copyright © Cambridge University Press 2012

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