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This work investigated the vorticity dynamics and stability of leading-edgevortices (LEVs) in revolving wings. Previous studies suggested that Coriolisacceleration and spanwise flow both played key roles in stabilizing the LEV;however, the exact mechanism remains unclear. The current study examined amechanism that relates the effects of Coriolis acceleration, spanwise flow, andthe tilting of the planetary vortex on limiting the growth of the LEV.Specifically, this mechanism states that a vertical gradient in spanwise flowcan create a vertical gradient in Coriolis acceleration, which will in turnproduce oppositely-signed vorticity within the LEV. This gradient of Coriolisacceleration corresponds to the spanwise (radial) component of planetary vortextilting (PVTr) that reorients the planetary vortex into the spanwise directiontherefore creating oppositely-signed LEV vorticity. Using an in-house,immersed-boundary-method flow solver, this mechanism was investigated alongsidethe other vorticity dynamics for revolving wings of varying aspect ratio (AR=3,5, and 7) and Reynolds number (Re=110, and 1400). Analyses of vorticitydynamics showed that the PVTr consistently produced oppositely-signed vorticityfor all values of AR and Re investigated, although other three-dimensionalphenomena play a similar but more dominant role when Re = 1400. In addition,the relative strength of the PVTr increased with increasing AR due to adecrease in the magnitude of advection. Finally, the effects of AR and Re onthe vorticity dynamics and LEV stability were also investigated.

Vorticity dynamics of revolving wings: The role of planetary vortex tilting on the stability of the leading-edge vortex