2015/07/31 by Matthias Grob, Annette Zippelius, Alfred Zippelius +1 · 1 citation
Chemical Engineering · Engineering · Materials Science · Physics and Astronomy · #CHAOS (operating system) #Composite material #Computer science #Geology #Granular flow and fluidized beds #Material Dynamics and Properties #Materials science #Mechanics #Physics #Rheology #Rheology and Fluid Dynamics Studies #Statistical physics #cond-mat.soft
paper · pdf · doi:10.1103/physreve.93.030901
published as Phys. Rev. E 93, 030901 (2016)
arxiv created 2016/03/02 · openalex publication_date 2016/03/14 · arxiv updated 2016/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A two-dimensional dense fluid of frictional grains is shown to exhibit time-chaotic, spatially heterogeneous flow in a range of stress values, σ, chosen in the unstable region of s-shaped flow curves. Stress-controlled simulations reveal a phase diagram with reentrant stationary flow for small and large stress σ. In between, no steady flow state can be reached, instead the system either jams or displays time-dependent heterogeneous strain rates γ(r,t). The results of simulations are in agreement with the stability analysis of a simple hydrodynamic model, coupling stress and microstructure which we tentatively associate with the frictional contact network.