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Fig. 9. Peak vorticity of LEV core and difference in peak vorticity between single-wing and two-wing flapping conditions. Peak vorticity was measured within the investigation areas shown in Fig. 7. (A) Difference (a–b) in peak vorticity between the one- (b) and two-wing (a) flapping conditions at five different DPIV layers, as indicated by the pictograms. (B) Averaged values of all five DPIV layers. Absolute LEV peak vorticity while flapping one wing is plotted in red; peak vorticity while flapping two wings is shown in blue. Vorticity difference (a–b) in B is shown in green.





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