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Effect of weak fluid inertia upon Jeffery orbits
KTH, School of Engineering Sciences (SCI), Mechanics.
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2015 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 91, no 4, 041002Article in journal (Refereed) Published
Abstract [en]

We consider the rotation of small neutrally buoyant axisymmetric particles in a viscous steady shear flow. When inertial effects are negligible the problem exhibits infinitely many periodic solutions, the "Jeffery orbits." We compute how inertial effects lift their degeneracy by perturbatively solving the coupled particle-flow equations. We obtain an equation of motion valid at small shear Reynolds numbers, for spheroidal particles with arbitrary aspect ratios. We analyze how the linear stability of the "log-rolling" orbit depends on particle shape and find it to be unstable for prolate spheroids. This resolves a puzzle in the interpretation of direct numerical simulations of the problem. In general, both unsteady and nonlinear terms in the Navier-Stokes equations are important.

Place, publisher, year, edition, pages
2015. Vol. 91, no 4, 041002
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-171690DOI: 10.1103/PhysRevE.91.041002ISI: 000353546300001ScopusID: 2-s2.0-84929095555OAI: diva2:844743

QC 20150807

Available from: 2015-08-07 Created: 2015-08-05 Last updated: 2015-08-07Bibliographically approved

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Lundell, Fredrik
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