Discrete-velocity approximations represent a popular way for computing the Boltzmann collision operator. The direct numerical evaluation of such methods involve a prohibitive cost, typically (
) where is the dimension of the velocity space. In this paper, following the ideas introduced in [C. Mouhot and L. Pareschi, 339 (2004) 71–76, C. Mouhot and L. Pareschi, 75 (2006) 1833–1852], we derive fast summation techniques for the evaluation of discrete-velocity schemes which permits to...
In this paper we introduce numerical schemes for a one-dimensional kinetic model of the Boltzmann equation with dissipative collisions and variable coefficient of restitution. In particular, we study the numerical passage of the Boltzmann equation with singular kernel to nonlinear friction equations in the so-called quasi elastic limit. To this aim we introduce a Fourier spectral method for the Boltzmann equation [25, 26] and show that the kernel modes that define the spectral method have the correct...
In this paper we introduce numerical schemes for a
one-dimensional kinetic model of the Boltzmann equation with
dissipative collisions and variable coefficient of restitution. In
particular, we study the numerical passage of the Boltzmann
equation with singular kernel to nonlinear friction equations in
the so-called quasi elastic limit. To this aim we introduce a
Fourier spectral method for the Boltzmann equation [CITE]
and show that the kernel modes that define the spectral method
have the correct...
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