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Fig. 1. Flow fields behind swimming eels according to two previous studies. Red
arrows indicate flow with clockwise rotation and blue arrows indicate
counter-clockwise rotation. (A) Results from Müller et al.
(2001), showing the wake
structure they observed. Proto-vortices (dotted lines) appear to be vortices
centered on the body that progress down the body. After they are shed into the
wake they are shown as dashed lines. They are shed after the stop/start vortex
(solid lines), resulting in two same-sign vortices being shed each tail beat.
(B) Computational fluid dynamic model of Carling et al.
(1998). The model indicates a
large flow wrapping around the eel, resulting in a net upstream flow in the
wake behind the eel.
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