The Swimmer-Boundary Fluid Interaction at Low Reynolds Number

Thursday, June 6, 2013 - 1:00pm - 1:45pm
Keller 3-180
Kenta Ishimoto (Kyoto University)
It is known that some microorganisms accumulate near a boundary, which has been recently found a hydrodynamic phenomenon.
To understand the diversity and complexity on the behavior and to give a comprehensive explanation, we have numerically investigated motion of an ellipsoidal squirmer in Stokes flow swimming near both a no-slip and free-slip infinite plane boundary. It is found that the fluid interaction due to the no-slip boundary is not only purely attractive or repulsive but rather more complicated with depending on the cell geometry and stroke pattern. Compared with the no-slip boundary, the swimmer cannot be stably confined near the boundary in presence of the free-slip boundary. As an example, swimming stability of a model sperm cell near a boundary will be also discussed.