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The circulation distribution of the wing-tip vortex core is analyzed in the near-field region of a rectangular wing at the downstream distance of several wing chord lengths. Experimental results, obtained earlier using particle image velocimetry, are compared to the analytical Burnham–Hallock vortex model. A modification of Burnham–Hallock model is proposed, that allows obtaining the circulation distribution in the wing-tip vortex core region based on the flowfield conditions and the downstream distance of the wing. [ABSTRACT FROM AUTHOR]

The numerical modeling of the flow around a rotor in the in-situ operating mode at different rotation speeds is considered. Based on the numerical modeling, an analysis of changes in the circulation of the rotor tip vortex in the near field was carried out. [ABSTRACT FROM AUTHOR]

Wingtip vortices of a finite span wing are analyzed numerically with the Reynolds-averaged Navier–Stokes equations. Vortex core parameters were identified using the Winding Angle method, the Q-criterion, λ2-criterion, and a modified Q-criterion defined as the difference of vorticity and strain rate tensors. [ABSTRACT FROM AUTHOR]