Gyrotaxis in a Steady Vortical Flow

William M. Durham, Eric Climent, Roman Stocker
2011 Physical Review Letters  
We show that gyrotactic motility within a steady vortical flow leads to tightly clustered aggregations of microorganisms. Two dimensionless numbers, characterizing the relative swimming speed and stability against overturning by vorticity, govern the coupling between motility and flow. Exploration of parameter space reveals a striking array of patchiness regimes. Aggregations are found to form within a few overturning time scales, suggesting that vortical flows might be capable of efficiently
more » ... parating species with different motility characteristics.
doi:10.1103/physrevlett.106.238102 pmid:21770545 fatcat:pfuxk42p3vc4deny5bxnfi2pvm