Coriolis effect and the attachment of the leading edge vortex

Thierry Jardin (1)

1 DAEP - Département Aérodynamique Energétique et Propulsion

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 rotating wing with the Coriolis term being artificially tuned. Reynolds numbers in the range Re [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 decreases.

Mots clés: Leading Edge Vortex; Coriolis

Domaines: Mécanique des fluides [physics.class-ph]

Thierry Jardin. Coriolis effect and the attachment of the leading edge vortex. Journal of Fluid Mechanics, 2017, vol. 820, pp. 312-340. ⟨10.1017/jfm.2017.222⟩. ⟨hal-01661763⟩