Numerical simulations show linear instability causing spatio-temporal complexity in inertialess elasto-viscoplastic channel flow at Weissenberg numbers of order unity and higher.
Rayleigh-Plateau instability of an elasto-viscoplastic filament
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abstract
A slender-thread model is used to explore the Rayleigh-Plateau instability of a filament of elasto-viscoplastic fluid. Without elasticity, a finite yield stress suppresses any linear instability for a filament of constant radius. Including sub-yield elastic deformation permits an elastic Rayleigh-Plateau instability above a critical Deborah number. If stresses over the thinner sections of the thread breach the yield threshold, viscoplastic deformations then drive the filament towards pinch-off. The thread consequently evolves to a beads-on-a-string structure. The elasto-plastic anatomy of the beads is explored and categorized.
fields
physics.flu-dyn 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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A transition to elasto-viscoplastic turbulence in inertialess channel flow?
Numerical simulations show linear instability causing spatio-temporal complexity in inertialess elasto-viscoplastic channel flow at Weissenberg numbers of order unity and higher.