3 papers
physics.flu-dyn2026
Fluid transport by a single active filament in a three-dimensional two-phase flow
Qian Mao, Umberto d'Ortona, Julien Favier
Micro-scale cilia play a vital role in mucociliary clearance (MCC) in the human respiratory airways. In this numerical study, we examine fluid transport driven by the active beatin…
cond-mat.soft2024
Origin of granular axial segregation bands in a rotating tumbler: An interface-mixing driven Rayleigh-Taylor instability
Umberto d'Ortona, Richard Lueptow, Nathalie Thomas
The origin of large and small particle axial bands in long rotating tumblers is a long-standing question. Using DEM simulations, we show that this axial segregation is due to a Ray…
physics.flu-dyn2024
Hydrodynamic coupling of a cilia--mucus system in Herschel--Bulkley flows
Q. Mao, Umberto d'Ortona, J. Favier
The yield stress and shear thinning properties of mucus are identified as critical for ciliary coordination and mucus transport in human airways. We use here numerical simulations…