Yang Yingzi, Elgeti Jens, Gompper Gerhard
Theoretical Soft Matter and Biophysics Group, Institut für Festkörperforschung, Forschungszentrum Jülich, D52425 Jülich, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Dec;78(6 Pt 1):061903. doi: 10.1103/PhysRevE.78.061903. Epub 2008 Dec 3.
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.
在体内浓度较高或体外靠近底物时，以低雷诺数游动的精子具有强烈的流体动力相互作用。摆动的尾部不仅推动精子在流体中前进，还会产生流场，精子通过该流场相互作用。我们使用基于粒子的介观模拟方法——多粒子碰撞动力学，研究二维流体中精子的流体动力相互作用与协同作用。我们通过研究摆动相位差与精子相对位置之间的关系以及能量消耗来分析精子行为。发现了流体动力相互作用的两种效应，即同步和吸引。有了这些流体动力效应，多精子系统表现出群体行为，平均簇大小与摆动频率分布宽度呈幂律依赖关系。
