Dresden 2026 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Franco-German Session on Granular Matter I
DY 19.5: Vortrag
Dienstag, 10. März 2026, 10:45–11:00, HÜL/S186
Tangential forces govern viscous-inertial transition in dense frictional granular suspensions — •Sudarshan Konidena1, Franco Tapia1, Alireza Khodabakhshi1, Élisabeth Guazzelli2, Pascale Aussillous3, and Bernhard Vowinckel1 — 1Institute of Urban and Industrial Water Management, Technische Universität Dresden, 01062 Dresden, Germany — 2Université Paris Cité, CNRS, Matière et Systèmes Complexes (MSC) UMR 7057, Paris, France — 3Aix Marseille Université, CNRS, IUSTI, Marseille, France
Using pressure-imposed rheology, we carry out particle-resolved simulations to study dense suspensions of frictional suspensions as they move from a viscous regime into an inertial one. By independently tuning the liquid viscosity, the shear rate, and the confining granular pressure, we determine that the onset of this transition always appears at a Stokes number near 8 and does not depend on the volume fraction. A key outcome is that the shear stress evolves toward its inertial behavior more slowly than the particle pressure. This delayed response arises from the combined influence of tangential contact forces and lubrication interactions, which govern how frictional particles gradually switch from predominantly rolling motions to predominantly sliding ones. Although the Stokes number dictates the overall shift, the degree of proximity to jamming also plays a role. We further explore how stronger inter-particle friction alters the characteristics of the viscous*inertial transition.
Keywords: frictional; jamming; viscous-inertial transition; rheology; microstructure