Communications on Applied Mathematics and Computation ›› 2026, Vol. 8 ›› Issue (4): 1478-1526.doi: 10.1007/s42967-025-00512-3

• ORIGINAL PAPERS • Previous Articles     Next Articles

Analysis of the Multi-dimensional Semi-discrete Active Flux Method Using the Fourier Transform

Wasilij Barsukow1, Janina Kern2, Christian Klingenberg2, Lisa Lechner2   

  1. 1. Institut de Mathématiques de Bordeaux (IMB), CNRS UMR 5251, 351 Cours de la Libération, 33405, Talence, France;
    2. Institute for Mathematics, University of Wurzburg, Emil-Fischer-Strasse 40, 97074, Wurzburg, Germany
  • Received:2024-12-07 Revised:2025-04-22 Accepted:2025-05-28 Online:2026-08-20 Published:2026-09-17
  • Supported by:
    WB, CK, and LL acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within SPP 2410 Hyperbolic Balance Laws in Fluid Mechanics: Complexity, Scales, Randomness (CoScaRa), project number 525941602.

Abstract: The degrees of freedom of Active Flux are cell averages and point values along the cell boundaries. The latter are shared between neighboring cells, which gives rise to a globally continuous reconstruction. The semi-discrete Active Flux method uses its degrees of freedom to obtain Finite Difference approximations to the spatial derivatives which are used in the point value update. The averages are updated using a quadrature of the flux and making use of the point values as quadrature points. The integration in time employs standard Runge-Kutta methods. We show that this generalization of the Active Flux method in two and three spatial dimensions is stationarity-preserving for linear acoustics on Cartesian grids, and present an analysis of numerical diffusion and stability.

Key words: Active flux, Stationarity-preserving, Linear acoustics, Fourier transform