local energy
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2022 ◽  
Vol 205 ◽  
pp. 107760
Author(s):  
Caishan Guo ◽  
Fengji Luo ◽  
Zexiang Cai ◽  
Zhao Yang Dong

2022 ◽  
Vol 42 ◽  
pp. 99-111
Author(s):  
Jussi Valta ◽  
Saku J. Mäkinen ◽  
Johanna Kirjavainen
Keyword(s):  

2022 ◽  
Vol 8 ◽  
pp. 99-113
Author(s):  
D. Strepparava ◽  
L. Nespoli ◽  
E. Kapassa ◽  
M. Touloupou ◽  
L. Katelaris ◽  
...  
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2022 ◽  
Vol 84 ◽  
pp. 102363
Author(s):  
Irati Otamendi-Irizar ◽  
Olatz Grijalba ◽  
Alba Arias ◽  
Claudia Pennese ◽  
Rufino Hernández

2022 ◽  
Vol 90 (3) ◽  
Author(s):  
Gregor J. Gassner ◽  
Magnus Svärd ◽  
Florian J. Hindenlang

AbstractThe 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.


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