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Coriolis effect and the attachment of the leading edge vortex

Published online by Cambridge University Press:  05 May 2017

T. Jardin Open the ORCID record for T. Jardin [Opens in a new window]
T. Jardin*
Affiliation:
Institut Supérieur de l’Aéronautique et de l’Espace (ISAE-Supaero), Université de Toulouse, 31055 Toulouse CEDEX 4, France
*
†Email address for correspondence: thierry.jardin@isae.fr
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Abstract

The role of the Coriolis effect on the attachment of the leading edge vortex (LEV) is investigated. Toward that end, the Navier–Stokes equations are solved in the non-inertial reference frame of a high angle of attack $\unicode[STIX]{x1D6FC}$ rotating wing with the Coriolis term being artificially tuned. Reynolds numbers in the range $Re\in [100;750]$ are considered to identify the interplay between Coriolis and viscous effects. Similarly, artificial tuning of the centrifugal term is achieved to identify the interplay between Coriolis and centrifugal effects. It is shown that (i) the Coriolis effect is the key element in LEV stability for $Re>200$ , (ii) viscous effects are the key element for $Re<200$ and (iii) centrifugal effects have a marginal role. The Coriolis effect is found to promote spanwise flow in the core and behind the LEV, which is known to promote outboard vorticity transport and presumably contributes to stabilizing the aft boundary layer. These mechanisms of LEV stabilization have increased authority as $\unicode[STIX]{x1D6FC}$ decreases.

JFM classification

Low-Reynolds-number flows: Low-Reynolds-number flows Biological Fluid Dynamics: Swimming/flying Vortex Flows: Vortex Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 820 , 10 June 2017 , pp. 312 - 340
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Copyright
© 2017 Cambridge University Press 

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