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

Julian Koellermeier*, Roman Pascal Schaerer, Manuel Torrilhon

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

37 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to) 531-549
Number of pages18
JournalKinetic & Related Models
Issue number3
Publication statusPublished - 2014
Externally publishedYes


  • Boltzmann equation
  • quadrature
  • hyperbolicity
  • kinetic equation

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