Boltzmann equation and hydrodynamics at the Burnett level
Alexander Bobylev Åsa Windfäll
Kinetic & Related Models 2012, 5(2): 237-260 doi: 10.3934/krm.2012.5.237
The hydrodynamics at the Burnett level is discussed in detail. First we explain the shortest way to derive the classical Burnett equations from the Boltzmann equation. Then we sketch all the computations needed for details of these equations. It is well known that the classical Burnett equations are ill-posed. We therefore explain how to make a regularization of these equations and derive the well-posed generalized Burnett equations (GBEs). We discuss briefly an optimal choice of free parameters in GBEs and consider a specific version of these equations. It is remarkable that this version of GBEs is even simpler than the original Burnett equations, it contains only third derivatives of density. Finally we prove a linear stability for GBEs. We also present some numerical results on the sound propagation based on GBEs and compare them with the Navier-Stokes results and experimental data.
keywords: Hydrodynamics regularized Burnett equations Stability sound propagation.
Transport coefficients in the $2$-dimensional Boltzmann equation
Alexander Bobylev Raffaele Esposito
Kinetic & Related Models 2013, 6(4): 789-800 doi: 10.3934/krm.2013.6.789
We show that a rarefied system of hard disks in a plane, described in the Boltzmann-Grad limit by the $2$-dimensional Boltzmann equation, has bounded transport coefficients. This is proved by showing opportune compactness properties of the gain part of the linearized Boltzmann operator.
keywords: transport coefficients. Boltzmann equation
Kinetic modeling of economic games with large number of participants
Alexander Bobylev Åsa Windfäll
Kinetic & Related Models 2011, 4(1): 169-185 doi: 10.3934/krm.2011.4.169
We study a Maxwell kinetic model of socio-economic behavior introduced in the paper A. V. Bobylev, C. Cercignani and I. M. Gamba, Commun. Math. Phys., 291 (2009), 599-644. The model depends on three non-negative parameters $\{\gamma, q ,s\}$ where $0<\gamma\leq 1$ is the control parameter. Two other parameters are fixed by market conditions. Self-similar solution of the corresponding kinetic equation for distribution of wealth is studied in detail for various sets of parameters. In particular, we investigate the efficiency of control. Some exact solutions and numerical examples are presented. Existence and uniqueness of solutions are also discussed.
keywords: Maxwell models distribution of wealth market economy. self-similar solutions
Discrete velocity models of the Boltzmann equation and conservation laws
Alexander Bobylev Mirela Vinerean Åsa Windfäll
Kinetic & Related Models 2010, 3(1): 35-58 doi: 10.3934/krm.2010.3.35
We consider in this paper the general problem of construction and classification of normal, i.e. without spurious invariants, discrete velocity models (DVMs) of the classical (elastic) Boltzmann equation. We explain in detail how this problem can be solved and present a complete classification of (i.e. we present all distinct) normal plane DVMs with relatively small number $n$ of velocities ($n\leq 10$). Some results for models with larger number of velocities are also presented.
keywords: Boltzmann equation discrete velocity models collision invariants. conservation laws

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