Stiff hyperbolic balance laws exhibit large spectral gaps, especially if the relaxation term significantly varies in space. Using examples from rarefied gases and the general form of the underlying balance law model, we perform a detailed spectral analysis of the semi-discrete model that reveals the spectral gaps. Based on that, we show the inefficiency of standard time integration schemes expressed by a severe restriction of the CFL number. We then develop the first spatially adaptive projective integration schemes to overcome the prohibitive time step constraints of standard time integration schemes. The new schemes use different time integration methods in different parts of the computational domain, determined by the spatially varying value of the relaxation time. We use our analytical results to derive accurate stability bounds for the involved parameters and show that the severe time step constraint can be overcome. The new adaptive schemes show good accuracy in a numerical test case and can obtain a large speedup with respect to standard schemes.
Mots clés : Projective integration, spatial adaptivity, hyperbolic balance law, moment equations
@article{SMAI-JCM_2022__8__295_0, author = {Koellermeier, Julian and Samaey, Giovanni}, title = {Spatially {Adaptive} {Projective} {Integration} {Schemes} {For} {Stiff} {Hyperbolic} {Balance} {Laws} {With} {Spectral} {Gaps}}, journal = {The SMAI Journal of computational mathematics}, pages = {295--325}, publisher = {Soci\'et\'e de Math\'ematiques Appliqu\'ees et Industrielles}, volume = {8}, year = {2022}, doi = {10.5802/smai-jcm.88}, language = {en}, url = {http://www.numdam.org/articles/10.5802/smai-jcm.88/} }
TY - JOUR AU - Koellermeier, Julian AU - Samaey, Giovanni TI - Spatially Adaptive Projective Integration Schemes For Stiff Hyperbolic Balance Laws With Spectral Gaps JO - The SMAI Journal of computational mathematics PY - 2022 SP - 295 EP - 325 VL - 8 PB - Société de Mathématiques Appliquées et Industrielles UR - http://www.numdam.org/articles/10.5802/smai-jcm.88/ DO - 10.5802/smai-jcm.88 LA - en ID - SMAI-JCM_2022__8__295_0 ER -
%0 Journal Article %A Koellermeier, Julian %A Samaey, Giovanni %T Spatially Adaptive Projective Integration Schemes For Stiff Hyperbolic Balance Laws With Spectral Gaps %J The SMAI Journal of computational mathematics %D 2022 %P 295-325 %V 8 %I Société de Mathématiques Appliquées et Industrielles %U http://www.numdam.org/articles/10.5802/smai-jcm.88/ %R 10.5802/smai-jcm.88 %G en %F SMAI-JCM_2022__8__295_0
Koellermeier, Julian; Samaey, Giovanni. Spatially Adaptive Projective Integration Schemes For Stiff Hyperbolic Balance Laws With Spectral Gaps. The SMAI Journal of computational mathematics, Tome 8 (2022), pp. 295-325. doi : 10.5802/smai-jcm.88. http://www.numdam.org/articles/10.5802/smai-jcm.88/
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