Gaussian Kinetic Model for Granular Gases
arXiv:cond-mat/0312113 · doi:10.1103/PhysRevE.69.051301
Abstract
A kinetic model for the Boltzmann equation is proposed and explored as a practical means to investigate the properties of a dilute granular gas. It is shown that all spatially homogeneous initial distributions approach a universal "homogeneous cooling solution" after a few collisions. The homogeneous cooling solution (HCS) is studied in some detail and the exact solution is compared with known results for the hard sphere Boltzmann equation. It is shown that all qualitative features of the HCS, including the nature of over population at large velocities, are reproduced semi-quantitatively by the kinetic model. It is also shown that all the transport coefficients are in excellent agreement with those from the Boltzmann equation. Also, the model is specialized to one having a velocity independent collision frequency and the resulting HCS and transport coefficients are compared to known results for the Maxwell Model. The potential of the model for the study of more complex spatially inhomogeneous states is discussed.
to be submitted to Phys. Rev. E
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Cited by in corpus (12)
- Instabilities in a free granular fluid described by the Enskog equation
- Universal velocity distributions in an experimental granular fluid
- Hydrodynamic Modes for a Granular Gas from Kinetic Theory
- System of elastic hard spheres which mimics the transport properties of a granular gas
- Granular mixtures modeled as elastic hard spheres subject to a drag force
- Maxwell and very hard particle models for probabilistic ballistic annihilation: hydrodynamic description
- Impurity in a sheared inelastic Maxwell gas
- Anomalous transport of impurities in inelastic Maxwell gases
- Defining Temperatures of Granular Powders Analogously with Thermodynamics to Understand the Jamming Phenomena
- Kinetic model for transport in granular mixtures
- Hydrodynamics for a granular gas from an exactly solvable kinetic model
- Analogous Viscosity Equations of Granular Powders Based on Eyrings Rate Process Theory and Free Volume Concept