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Steady base states for non-Newtonian granular hydrodynamics

Published online by Cambridge University Press:  19 February 2013

Francisco Vega Reyes ,
Andrés Santos  and
Vicente Garzó
Francisco Vega Reyes*
Affiliation:
Departamento de Física, Universidad de Extremadura, 06071 Badajoz, Spain
Andrés Santos
Affiliation:
Departamento de Física, Universidad de Extremadura, 06071 Badajoz, Spain
Vicente Garzó
Affiliation:
Departamento de Física, Universidad de Extremadura, 06071 Badajoz, Spain
*
†Email address for correspondence: [email protected]
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Abstract

We study in this work steady laminar flows in a low-density granular gas modelled as a system of identical smooth hard spheres that collide inelastically. The system is excited by shear and temperature sources at the boundaries, which consist of two infinite parallel walls. Thus, the geometry of the system is the same that yields the planar Fourier and Couette flows in standard gases. We show that it is possible to describe the steady granular flows in this system, even at large inelasticities, by means of a (non-Newtonian) hydrodynamic approach. All five types of Couette–Fourier granular flows are systematically described, identifying the different types of hydrodynamic profiles. Excellent agreement is found between our classification of flows and simulation results. Also, we obtain the corresponding nonlinear transport coefficients by following three independent and complementary methods: (i) an analytical solution obtained from Grad’s 13-moment method applied to the inelastic Boltzmann equation; (ii) a numerical solution of the inelastic Boltzmann equation obtained by means of the direct simulation Monte Carlo method; and (iii) event-driven molecular dynamics simulations. We find that, while Grad’s theory does not describe quantitatively well all transport coefficients, the three procedures yield the same general classification of planar Couette–Fourier flows for the granular gas.

JFM classification

Granular media: Granular media Rarefied Gas Flow: Kinetic theory Non-Newtonian Flows: Non-Newtonian Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 719 , 25 March 2013 , pp. 431 - 464
Copyright
©2013 Cambridge University Press

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