A Novel Fully Decoupled Scheme for the MHD System with Variable Density

In this paper, we first establish a novel first-order, fully decoupled, unconditionally stable time discretization scheme for the MHD system with variable density. This scheme successfully decouples all the coupling terms by combining the gauge-Uzawa method and the scalar auxiliary variable (SAV) me...

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Published inJournal of computational methods in applied mathematics Vol. 25; no. 1; pp. 215 - 236
Main Authors Wang, Zhaowei, Wang, Danxia, Jia, Hongen
Format Journal Article
LanguageEnglish
Published Minsk De Gruyter 01.01.2025
Walter de Gruyter GmbH
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ISSN1609-4840
1609-9389
DOI10.1515/cmam-2024-0004

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Abstract In this paper, we first establish a novel first-order, fully decoupled, unconditionally stable time discretization scheme for the MHD system with variable density. This scheme successfully decouples all the coupling terms by combining the gauge-Uzawa method and the scalar auxiliary variable (SAV) method. And we prove its unconditional energy stability. Then we give the first-order finite element scheme and its implementation. Furthermore, we perform a rigorous error analysis of the proposed numerical scheme. Finally, we perform some numerical experiments to demonstrate the effectiveness of the decoupling scheme.
AbstractList In this paper, we first establish a novel first-order, fully decoupled, unconditionally stable time discretization scheme for the MHD system with variable density. This scheme successfully decouples all the coupling terms by combining the gauge-Uzawa method and the scalar auxiliary variable (SAV) method. And we prove its unconditional energy stability. Then we give the first-order finite element scheme and its implementation. Furthermore, we perform a rigorous error analysis of the proposed numerical scheme. Finally, we perform some numerical experiments to demonstrate the effectiveness of the decoupling scheme.
In this paper, we first establish a novel first-order, fully decoupled, unconditionally stable time discretization scheme for the MHD system with variable density. This scheme successfully decouples all the coupling terms by combining the gauge-Uzawa method and the scalar auxiliary variable (SAV) method. And we prove its unconditional energy stability. Then we give the first-order finite element scheme and its implementation. Furthermore, we perform a rigorous error analysis of the proposed numerical scheme. Finally, we perform some numerical experiments to demonstrate the effectiveness of the decoupling scheme.
Author Wang, Zhaowei
Wang, Danxia
Jia, Hongen
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SubjectTerms 65Mxx
65N12
65N22
65Nxx
Decoupling
Density
Error Analysis
Fully Decoupled
Gauge-Uzawa Method
Mathematical analysis
Mathematics
Unconditionally Stable
Variable Density
Title A Novel Fully Decoupled Scheme for the MHD System with Variable Density
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