Effects of hydrodynamic interactions on rectified transport of   self-propelled particles
  Directed transport of self-propelled particles is numerically investigated in a three-dimensional asymmetric potential. Beside the steric repulsive forces, hydrodynamic interactions between particles have been taken into account in an approximate way. From numerical simulations, we find that hydrodynamic interactions can strongly affect the rectified transport of self-propelled particles. Hydrodynamic interactions enhance the performance of the rectified transport when particles can easily pass across the barrier of the potential, and reduce the rectified transport when particles are mainly trapped in the potential well. 
Bao-quan Ai, Ya-feng He, Wei-rong Zhong
cond-mat.soft cond-mat.stat-mech