Fig. 3. Far-field flow structures around a hovering fruit fly. Absolute
iso-vorticity surfaces and velocity vectors with a body (Ai,ii,Bi,ii,Ci,ii,Di)
and without a body (Aiv,v,Biv,v,Civ,v,Diii) at four instances of (a), (b), (e)
and (g), respectively, as illustrated in
Fig. 2C. (Aiii,Biii,Ciii,Dii)
The corresponding velocity vectors and contours of vertical velocity
components in the stroke plane (red broken circle).