Article Contents

2014, Volume 7, Issue 3: 531-549. Doi: 10.3934/krm.2014.7.531

This issue Previous Article Approximate models for stochastic dynamic systems with velocities on the sphere and associated Fokker--Planck equations Next Article One-species Vlasov-Poisson-Landau system near Maxwellians in the whole space

A framework for hyperbolic approximation of kinetic equations using quadrature-based projection methods

1.
Center for Computational Engineering Science, RWTH Aachen University, Schinkelstr.2, 52062 Aachen

Received: January 2014

Revised: March 2014

Published: September 2014

Abstract / Introduction Related Papers Cited by

Abstract

We derive hyperbolic PDE systems for the solution of the Boltzmann Equation. First, the velocity is transformed in a non-linear way to obtain a Lagrangian velocity phase space description that allows for physical adaptivity. The unknown distribution function is then approximated by a series of basis functions.
Standard continuous projection methods for this approach yield PDE systems for the basis coefficients that are in general not hyperbolic. To overcome this problem, we apply quadrature-based projection methods which modify the structure of the system in the desired way so that we end up with a hyperbolic system of equations.
With the help of a new abstract framework, we derive conditions such that the emerging system is hyperbolic and give a proof of hyperbolicity for Hermite ansatz functions in one dimension together with Gauss-Hermite quadrature.

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Mathematics Subject Classification: Primary: 35Q20; Secondary: 35Q35.

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