WIAS Preprint No. 2415, (2017)

A stochastic algorithm without time discretization error for the Wigner equation



Authors

  • Muscato, Orazio
  • Wagner, Wolfgang

2010 Mathematics Subject Classification

  • 65C05 60J25 81Q05

Keywords

  • Wigner equation, stochastic algorithms, numerical experiments

DOI

10.20347/WIAS.PREPRINT.2415

Abstract

Stochastic particle methods for the numerical treatment of the Wigner equation are considered. The approximation properties of these methods depend on several numerical parameters. Such parameters are the number of particles, a time step (if transport and other processes are treated separately) and the grid size (used for the discretization of the position and the wave-vector). A stochastic algorithm without time discretization error is introduced. Its derivation is based on the theory of piecewise deterministic Markov processes. Numerical experiments are performed in a one-dimensional test case. Approximation properties with respect to the grid size and the number of particles are studied. Convergence of a time-splitting scheme to the no-splitting algorithm is demonstrated. The no-splitting algorithm is shown to be more efficient in terms of computational effort.

Download Documents