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A novel averaging technique for discrete entropy-stable dissipation operators for ideal MHD
I. Physikalisches Institut, Universität zu Köln, Köln, Germany.
Mathematisches Institut, Universität zu Köln, Köln, Germany.ORCID iD: 0000-0002-5902-1522
Mathematisches Institut, Universität zu Köln, Köln, Germany.
I. Physikalisches Institut, Universität zu Köln, Köln, Germany.
2017 (English)In: Journal of Computational Physics, ISSN 0021-9991, E-ISSN 1090-2716, Vol. 330, p. 624-632Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 330, p. 624-632
Keywords [en]
magnetohydrodynamics, entropy stable, entropy Jacobian, kinetic energy preserving
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:liu:diva-156854DOI: 10.1016/j.jcp.2016.10.055ISI: 000394408900033Scopus ID: 2-s2.0-85028244957OAI: oai:DiVA.org:liu-156854DiVA, id: diva2:1315778
Funder
German Research Foundation (DFG), SPP 1573Available from: 2019-05-14 Created: 2019-05-14 Last updated: 2019-05-23Bibliographically approved

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