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Updated: May 29, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Dense granular flow around a penetrating object: experiment and hydrodynamic model
A Seguin1, Y Bertho, P Gondret
1Univ Paris-Sud, Univ Paris 6, CNRS, Lab FAST, Bâtiment 502, Campus Univ, F-91405 Orsay, France.
Abstract:
We present in this Letter experimental results on the bidimensional flow field around a cylinder penetrating into dense granular matter, together with drag force measurements. A hydrodynamic model based on extended kinetic theory for dense granular flow reproduces well the flow localization close to the cylinder and the corresponding scalings of the drag force, which is found to not depend on velocity, but linearly on the pressure and on the cylinder diameter and weakly on the grain size. Such a regime is found to be valid at a low enough "granular" Reynolds number.
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