Kinetic scrape off layer simulations with semi-Lagrangian discontinuous Galerkin schemes

In this paper we propose a semi-Lagrangian discontinuous Galerkin solver for the simulation of the scrape off layer for an electron-ion plasma. We use a time adaptive velocity space to deal with fast particles leaving the computational domain, a block structured mesh to resolve the sharp gradient in...

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Bibliographic Details
Published in:	Computer physics communications Vol. 316; p. 109775
Main Authors:	Einkemmer, Lukas, Moriggl, Alexander
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01.11.2025
Subjects:	General purpose computing on graphic processing units Limiters Plasma sheath Scrape off layer Semi-Lagrangian discontinuous Galerkin schemes General purpose computing on graphic processing units Scrape off layer Limiters Semi-Lagrangian discontinuous Galerkin schemes Plasma sheath
ISSN:	0010-4655
Online Access:	Get full text
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Summary:	In this paper we propose a semi-Lagrangian discontinuous Galerkin solver for the simulation of the scrape off layer for an electron-ion plasma. We use a time adaptive velocity space to deal with fast particles leaving the computational domain, a block structured mesh to resolve the sharp gradient in the plasma sheath, and limiters to avoid oscillations in the density function. In particular, we propose a limiter that can be computed directly from the information used in the semi-Lagrangian discontinuous Galerkin advection step. This limiter can be directly implemented as part of the GPU kernel of the scheme, which avoids an expensive post processing step. We provide numerical results for a set of benchmark problems and compare different limiting strategies.
ISSN:	0010-4655
DOI:	10.1016/j.cpc.2025.109775