This title appears in the Scientific Report : 2008 

Cooperation of Sperm in Two Dimensions: Synchronization, Attraction and Aggregation through Hydrodynamic Interactions
Yang, Y.
Elgeti, J. / Gompper, G.
Theorie der Weichen Materie und Biophysik; IFF-2
Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM
Physical review / E, 78 (2008) S. 061903
College Park, Md. APS 2008
Journal Article
Kondensierte Materie
Physical Review E 78
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Sperm swimming at low Reynolds number have strong hydrodynamic interactions when their concentration is high in vivo or near substrates in vitro. The beating tails not only propel the sperm through a fluid, but also create flow fields through which sperm interact with each other. We study the hydrodynamic interaction and cooperation of sperm embedded in a two-dimensional fluid by using a particle-based mesoscopic simulation method, multiparticle collision dynamics. We analyze the sperm behavior by investigating the relationship between the beating-phase difference and the relative sperm position, as well as the energy consumption. Two effects of hydrodynamic interaction are found, synchronization and attraction. With these hydrodynamic effects, a multisperm system shows swarm behavior with a power-law dependence of the average cluster size on the width of the distribution of beating frequencies.