Particles held by springs in a linear shear flow exhibit oscillatory motion.

@article{Holzer2006ParticlesHB,
  title={Particles held by springs in a linear shear flow exhibit oscillatory motion.},
  author={Lukas Holzer and Walter Zimmermann},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2006},
  volume={73 6 Pt 1},
  pages={060801}
}
The dynamics of small spheres that are held by linear springs in a low Reynolds number shear flow at neighboring locations is investigated. The flow elongates the beads, and the interplay of the shear gradient with the nonlinear behavior of the hydrodynamic interaction among the spheres causes in a large range of parameters a bifurcation to a surprising oscillatory bead motion. The parameter ranges wherein this bifurcation is either super- or subcritical are determined. 

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