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Fig. 8. Temporal evolution of arbitrary upstream fluid parcels. Fluid particles in
adjacent regions with a horizontal (A,B) or vertical (C,D) interface are
labeled magenta or green in order to track their evolution. The interfaces in
both cases do not coincide with the repelling LCS (red curves). After
interaction with the swimmer (shown here in a reference frame fixed on the
swimmer; the swimmer moves from right to left in a laboratory reference frame;
see Fig. 5), the particles in
the adjacent parcels exhibit substantial deformation and mixing in the
vicinity of the attracting LCS (blue curves). In both cases, the parcels do
not indicate the full extent of the downstream wake, in contrast to the
repelling LCS parcels in Fig.
7. S, swimmer; RLCS, repelling LCS; ALCS, attracting LCS. (A,C)
Time t=0; (B,D) t=(14/5)T, where T is the
duration of a single swimming cycle. See Movies 5 and 6 in supplementary
material.
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