Communications on Applied Mathematics and Computation ›› 2019, Vol. 1 ›› Issue (3): 333-360.doi: 10.1007/s42967-019-00027-8

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A Semi-Lagrangian Spectral Method for the Vlasov-Poisson System Based on Fourier, Legendre and Hermite Polynomials

Lorella Fatone1, Daniele Funaro2, Gianmarco Manzini3   

  1. 1 Dipartimento di Matematica, Università degli Studi di Camerino, Camerino, Italy;
    2 Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Modena, Italy;
    3 Group T-5, Applied Mathematics and Plasma Physics, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, USA
  • Received:2018-06-18 Revised:2018-12-31 Online:2019-09-20 Published:2019-09-09
  • Supported by:
    The second author was partially supported by the Short Term Mobility Program of the Consiglio Nazionale delle Ricerche (CNR-Italy). The third author was supported by the Laboratory Directed Research and Development Program (LDRD), U.S. Department of Energy Office of Science, Office of Fusion Energy Sciences, and the DOE Office of Science Advanced Scientific Computing Research (ASCR) Program in Applied Mathematics Research, under the auspices of the National Nuclear Security Administration of the U.S. Department of Energy by Los Alamos National Laboratory, operated by Los Alamos National Security LLC under contract DE-AC52-06NA25396.

Abstract: In this work, we apply a semi-Lagrangian spectral method for the Vlasov-Poisson system, previously designed for periodic Fourier discretizations, by implementing Legendre polynomials and Hermite functions in the approximation of the distribution function with respect to the velocity variable. We discuss second-order accurate-in-time schemes, obtained by coupling spectral techniques in the space-velocity domain with a BDF timestepping scheme. The resulting method possesses good conservation properties, which have been assessed by a series of numerical tests conducted on some standard benchmark problems including the two-stream instability and the Landau damping test cases. In the Hermite case, we also investigate the numerical behavior in dependence of a scaling parameter in the Gaussian weight. Confirming previous results from the literature, our experiments for different representative values of this parameter, indicate that a proper choice may significantly impact on accuracy, thus suggesting that suitable strategies should be developed to automatically update the parameter during the time-advancing procedure.

Key words: Spectral methods, Semi-Lagrangian methods, High-order, Hermite functions, Vlasov-Poisson equations, Mass conservation

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