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The transient relaxation process of the leading-edge vortex on a delta wing pitched to high angle of attack is quantitatively characterized using high-image density particle image velocimetry. Instantaneous distributions of azimuthal vorticity and patterns of sectional streamlines over an entire plane allow definition of a new, rapidly evolving mechanism at the onset of vortex breakdown; it marks the transition from a relatively high to low upstream propagation speed of the breakdown.
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Lin et al. (1995) studied this question.
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