Universität zu Köln

Gassner, Gregor J., Svard, Magnus and Hindenlang, Florian J. (2022). Stability Issues of Entropy-Stable and/or Split-form High-order Schemes Analysis of Linear Stability. J. Sci. Comput., 90 (3). NEW YORK: SPRINGER/PLENUM PUBLISHERS. ISSN 1573-7691

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Abstract

The focus of the present research is on the analysis of local energy stability of high-order (including split-form) summation-by-parts methods, with e.g. two-point entropy-conserving fluxes, approximating non-linear conservation laws. Our main finding is that local energy stability, i.e., the numerical growth rate does not exceed the growth rate of the continuous problem, is not guaranteed even when the scheme is non-linearly stable and that this may have adverse implications for simulation results. We show that entropy-conserving two-point fluxes are inherently locally energy unstable, as they can be dissipative or anti-dissipative. Unfortunately, these fluxes are at the core of many commonly used high-order entropy-stable extensions, including split-form summation-by-parts discontinuous Galerkin spectral element methods (or spectral collocation methods). For the non-linear Burgers equation, we further demonstrate numerically that such schemes cause exponential growth of errors during the simulation. Furthermore, we encounter a similar abnormal behaviour for the compressible Euler equations, for a smooth exact solution of a density wave. Finally, for the same case, we demonstrate numerically that other commonly known split-forms, such as the Kennedy and Gruber splitting, are also locally energy unstable.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gassner, Gregor J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Svard, Magnus UNSPECIFIED UNSPECIFIED UNSPECIFIED Hindenlang, Florian J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-674487
DOI:	10.1007/s10915-021-01720-8
Journal or Publication Title:	J. Sci. Comput.
Volume:	90
Number:	3
Date:	2022
Publisher:	SPRINGER/PLENUM PUBLISHERS
Place of Publication:	NEW YORK
ISSN:	1573-7691
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NAVIER-STOKES EQUATIONS; NONLINEAR CONSERVATION-LAWS; NUMERICAL VISCOSITY; CONVECTIVE TERMS; FORMULATIONS; SYSTEMS; DISCRETIZATION Multiple languages Mathematics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67448