Simulation snapshots showing the distribution of active particles confined in two connected chambers. The arrows indicate flow currents generated spontaneously by the moving particles.

From the article:

Self-Sustained Density Oscillations of Swimming Bacteria Confined in Microchambers
M. Paoluzzi, R. Di Leonardo, and L. Angelani
Phys. Rev. Lett. 115, 188303 (2015)

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