Derigs, Dominik ORCID: 0000-0002-9687-2035, Winters, Andrew R., Gassner, Gregor J. and Walch, Stefanie (2017). A novel averaging technique for discrete entropy-stable dissipation operators for ideal MHD. J. Comput. Phys., 330. S. 624 - 633. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2716

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Abstract

Entropy stable schemes can be constructed with a specific choice of the numerical flux function. First, an entropy conserving flux is constructed. Secondly, an entropy stable dissipation term is added to this flux to guarantee dissipation of the discrete entropy. Present works in the field of entropy stable numerical schemes are concerned with thorough derivations of entropy conservative fluxes for ideal MHD. However, as we show in this work, if the dissipation operator is not constructed in a very specific way, it cannot lead to a generally stable numerical scheme. The two main findings presented in this paper are that the entropy conserving flux of Ismail & Roe can easily break down for certain initial conditions commonly found in astrophysical simulations, and that special care must be taken in the derivation of a discrete dissipation matrix for an entropy stable numerical scheme to be robust. We present a convenient novel averaging procedure to evaluate the entropy Jacobians of the ideal MHD and the compressible Euler equations that yields a discretization with favorable robustness properties. (C) 2016 Elsevier Inc. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Derigs, DominikUNSPECIFIEDorcid.org/0000-0002-9687-2035UNSPECIFIED
Winters, Andrew R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gassner, Gregor J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Walch, StefanieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-241111
DOI: 10.1016/j.jcp.2016.10.055
Journal or Publication Title: J. Comput. Phys.
Volume: 330
Page Range: S. 624 - 633
Date: 2017
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication: SAN DIEGO
ISSN: 1090-2716
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
CONSERVATION-LAWS; HIGH-ORDER; SYSTEMS; EQUATIONS; SCHEMESMultiple languages
Computer Science, Interdisciplinary Applications; Physics, MathematicalMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/24111

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