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Fig. 2. Schematic of wake vortex parameters described in the text. The distribution
of wake vorticity
(x) is indicated by grey patches in this
cross-section view. Hypothetical flow streamlines inside the vortex are
sketched below the vortex patches. The integrals in Eq. 4 are evaluated
throughout the vortex volume VV and on the vortex surface
SV. The dimension S is the wake vortex width.