Digital particle image velocimetry (DPIV) has been applied to animal-generated flows since 1993 to map the flow patterns and vortex wakes produced by a range of feeding and swimming aquatic animals, covering a Re range of 10–2–105. In this paper, the special circumstances, problems and some solutions on many aspects of PIV, which arise from working with living animals, are discussed and illustrated. Topics covered are the experimental set-up, animal housing, restraining animals, animal training, flow tanks, seeding, illumination, imaging, analysis accuracy and result interpretation. Examples include the feeding currents of different juvenile stages of copepods, filter feeding in acorn barnacles, filter feeding in cockles and soft-shelled clams, the wake of burst-swimming zebra danios, burrow ventilation in a mudshrimp and the vortex chain wake of a swimming mullet. DPIV appeared to be a powerful tool for studying animal-generated flows. However, PIV has to be applied with caution and often needs to be adapted to the particular circumstances to take into account the presence of animals and to ensure that the mapped flow phenomena arise from normal behaviour.
Experiments in Fluids – Springer Journals
Published: Dec 18, 2002
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