Effect of fluid inertia on the motion of a collinear swimmer.
basic_science · Level V
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- Record sourced from PubMed, PMID 28085427.
- Also identified by DOI 10.1103/PhysRevE.94.063114.
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Abstract
The swimming of a two-sphere system and of a three-sphere chain in an incompressible viscous fluid is studied on the basis of simplified equations of motion which take account of both Stokes friction and added mass effects. The analysis is based on an explicit expression for the asymptotic periodic swimming velocity and a corresponding evaluation of the mean rate of dissipation. The mean swimming velocity of the two-sphere system is found to be nonvanishing provided that the two spheres are not identical. The swimming of a comparable chain of three identical spheres is much more efficient.