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Fig. 6. Examples of the velocity field generated by a crayfish measured in a
horizontal plane LS1 (Fig. 2).
(A) The instantaneous velocity field (B–D) averages over 30
instantaneous measurements taken at 1 s time intervals. Velocity field A is
one of those used to obtain the field C. Fields A–C were recorded from a
female animal; the field D was recorded from a male. The fluid converged
towards the animal head region, escaping within the jets located outside the
plane of measurement. Negative images of the animal cut from a PIV image are
shown for a reference. Reference segments at the bottom left, 2 cm; reference
vector, 1 cm s–1. The jets created by the animal are outside
the plane of measurement and thus are not observed in the vector field.
Profiles of the horizontal fluid velocity along the enumerated streamlines
(broken lines) are correspondingly plotted in
Fig. 8A–D.
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