Numerical study of two disks settling in an Oldroyd-B fluid: From periodic interaction to chaining

Tsorng Whay Pan, Roland GLOWINSKI

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In this article, we present a numerical study of the dynamics of two disks sedimenting in a narrow vertical channel filled with an Oldroyd-B fluid. Two kinds of particle dynamics are observed: (i) a periodic interaction between the two disks, and (ii) the formation of a two-disk chain. For the periodic interaction of the two disks, two different motions are observed: (a) the two disks stay far apart and interact periodically, and (b) the two disks interact closely and then far apart in a periodic way, like the drafting, kissing, and tumbling of two disks sedimenting in a Newtonian fluid, due to a weak elastic force. Concerning the formation of a two-disk chain occurring at higher values of the elasticity number, either a tilted chain or a vertical chain is observed. Our simulations show that, as expected, the values of the elasticity and Mach numbers are the determining factors concerning the particle chain formation and its orientation.

Original languageEnglish
Article number063103
JournalPhysical Review E
Volume96
Issue number6
DOIs
Publication statusPublished - 4 Dec 2017

Scopus Subject Areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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