Shear state of freely evolving granular gases

Abstract

Hydrodynamic equations are used to identify the final state reached by a freely evolving granular gas above but close to its shear instability. The theory predicts the formation of a two bands shear state with a steady density profile. There is a modulation between temperature and density profiles as a consequence of the energy balance, the density fluctuations remaining small, without producing clustering. Moreover, the time dependence of the velocity field can be scaled out with the squared root of the average temperature of the system. The latter follows the Haff law, but with an effective cooling rate that is smaller than that of the free homogeneous state. The theoretical predictions are compared with numerical results for inelastic hard disks obtained by using the direct Monte Carlo simulation method, and a good agreement is obtained for low inelasticity.

References in corpus (7)

• Inherent Rheology of a Granular Fluid in Uniform Shear Flow
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Cited by in corpus (2)

• Free Cooling Phase-Diagram of Hard-Spheres with Short- and Long-Range Interactions
• Navier-Stokes hydrodynamics of thermal collapse in a freely cooling granular gas