The swimming velocity and rate of dissipation of a linear chain consisting of
two or three little spheres and a big sphere is studied on the basis of low
Reynolds number hydrodynamics. The big sphere is treated as a passive cargo,
driven by the tail of little spheres via hydrodynamic and direct elastic
interaction. The fundamental solution of Stokes' equations in the presence of a
sphere with no-slip boundary condition, as derived by Oseen, is used to model
the hydrodynamic interactions between the big sphere and the little spheres.Comment: 15 pages, 9 figure
