Numerical analysis of the angular motion of a neutrally buoyant spheroid in shear flow at small Reynolds numbers

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
T RosénB Mehlig

Abstract

We numerically analyze the rotation of a neutrally buoyant spheroid in a shear flow at small shear Reynolds number. Using direct numerical stability analysis of the coupled nonlinear particle-flow problem, we compute the linear stability of the log-rolling orbit at small shear Reynolds number Re_{a}. As Re_{a}→0 and as the box size of the system tends to infinity, we find good agreement between the numerical results and earlier analytical predictions valid to linear order in Re_{a} for the case of an unbounded shear. The numerical stability analysis indicates that there are substantial finite-size corrections to the analytical results obtained for the unbounded system. We also compare the analytical results to results of lattice Boltzmann simulations to analyze the stability of the tumbling orbit at shear Reynolds numbers of order unity. Theory for an unbounded system at infinitesimal shear Reynolds number predicts a bifurcation of the tumbling orbit at aspect ratio λ_{c}≈0.137 below which tumbling is stable (as well as log rolling). The simulation results show a bifurcation line in the λ-Re_{a} plane that reaches λ≈0.1275 at the smallest shear Reynolds number (Re_{a}=1) at which we could simulate with the lattice Boltzmann cod...Continue Reading

References

Oct 4, 2012·Physical Review Letters·Shima ParsaGreg A Voth
Feb 4, 2014·Physical Review Letters·K GustavssonB Mehlig
May 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J EinarssonB Mehlig
Jun 13, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·T RosénF Lundell
Jun 13, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·F CandelierJ-R Angilella

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Citations

Nov 26, 2016·Physical Review Letters·F CandelierB Mehlig
Jan 20, 2018·Physical Review. E·Tomas RosénFredrik Lundell

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