Settling and fluidization of tall cylinders in solid-liquid suspensions

Jacobus Derksen* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We numerically study how rigid solid cylinders with a length over diameter aspect ratio of 10 settle through suspensions consisting of uniformly sized solid spheres and Newtonian liquid. We identify regimes with preference for horizontal settling and vertical settling of the cylinders dependent on the overall solids volume fraction (in the range of 0 to 0.58) and the Archimedes number of the cylinders. These insights we use to interpret the behaviour of fluidized suspensions consisting of mixtures of spheres and cylinders with an emphasis on cylinder orientation distributions and slip velocities between solids and liquid phase. The three-dimensional and time dependent simulations explicitly resolve the solid-liquid interfaces by applying an immersed boundary method contained in a lattice-Boltzmann flow solver.
Original languageEnglish
Article numbere18072
Number of pages10
JournalAIChE Journal
Issue number7
Publication statusPublished - Jul 2023

Data Availability Statement

Data available on request from the authors.


  • particle-resolved simulation
  • non-spherical particles
  • lattice-Boltzmann method
  • liquid fluidization


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