Related Experiment Video
Updated: Jun 18, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Effect of noise on solid-to-liquid transition in small granular systems under shear
Martin F Melhus1, Igor S Aranson, Dmitri Volfson
1Department of Physics, Northwestern University, Evanston, Illinois 60208-3112, USA.
Abstract:
The effect of noise on the solid-to-liquid transition of a dense granular assembly under planar shear is studied numerically using soft-particle molecular dynamics simulations in two dimensions. We focus on small systems in a thin planar Couette cell, examining the bistable region while increasing shear, with varying amounts of random noise, and determine statistics of the shear required for fluidization. In the absence of noise, the threshold value of the shear stress depends on the preparation of the system and has a broad distribution. However, adding force fluctuations both lowers the mean threshold value of the shear stress and decreases its variability. This behavior is interpreted as thermoactivated escape through a fluctuating barrier.
More Related Videos
09:08Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
Published on: February 6, 2014
09:00Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
Published on: September 29, 2019
Related Concept Videos
Newtonian Fluid: Problem Solving
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
Types of Fluids
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and their...
Speed of Sound in Solids and Liquids
Steady, Laminar Flow Between Parallel Plates
Two Components: Liquid–Liquid Systems
Normal and Shear Force