Biological Fluid Mechanics -- Flowtrace

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9. W. Gilpin, Vivek N. Prakash, and M. Prakash
Flowtrace: simple visualization of coherent structures in biological fluid flows
Journal of Experimental Biology, 220, 3411-3418 (2017) 

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Download Flowtrace here: www.flowtrace.org
Cover of Journal of Experimental Biology (Volume 220, 2017) [web link]

Gallery of videos generated using Flowtrace

The unsteady feeding currents generated by the veliger larva of a moon snail

A zoomed-out view of the feeding current of Stentor sp., collected from a pond. The entrainment of large particles is apparent, as are many smaller algae and protists that are able to escape the flow. Video shown at 8x true speed.

The feeding current of the protist Stentor sp. (zoomed in)

A stagnation point in the flow of cerebrospinal fluid in a mouse brain ventricle. Movie shown in real time, projections correspond to 0.6s traces with median subtraction applied. Video taken from Supplementary Video 2 of Faubel et al. Science 2016

A sea anemone pumps water into its body cavity, entraining particles suspended in the water.. 

Behavioral transitions in a school of swimming minnows (golden shiners).

Video shown at 16x true speed, with projection time 5.333 s. Data taken from Tunstrøm et al. PLOS Computational Biology, 2013.

Swarming insects: The result of running Flowtrace with a 333 ms projection window on video of swarming insects. The original video of midges is taken from Attanasi et al, PLoS Comp Bio, July 2014

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