On the mach-uniformity of the Lagrange-projection scheme

Zakerzadeh, Hamed¹

¹ Institut für Geometrie und Praktische Mathematik, RWTH Aachen, Templergraben 55, 52056 Aachen, Germany.

ESAIM: Mathematical Modelling and Numerical Analysis , Tome 51 (2017) no. 4, pp. 1343-1366

Résumé

In the present work, we show that the Implicit-Explicit Lagrange-projection scheme applied to the isentropic Euler equations, presented in Coquel et al.’s paper (Math. Comp. 79 (2010) 1493–1533), is asymptotic preserving regarding the Mach number, $i.e$., it is asymptotically stable in $\ell {}_{\infty }$-norm with unrestrictive CFL condition for all-Mach flows, and asymptotically consistent which means that it gives a consistent discretization to the incompressible Euler equations in the limit, $e.g$., it preserves the incompressible limit as to satisfy the $div$-free condition and the analogues of continuous-level asymptotic expansion for the density. This consistency analysis has been done formally as well as rigorously. Moreover, we prove that the scheme is positivity-preserving and entropy-admissible under some Mach-uniform restrictions. The analysis is similar to what has been presented in the original paper, but with the emphasis on the uniformity regarding the Mach number, which is crucial for a scheme to be useful in the low-Mach regime. We then extend the modified (but similar) analysis to the shallow water equations with topography and get similar stability and consistency results.

Détail

Reçu le : 2016-04-01
Accepté le : 2016-09-12
DOI : 10.1051/m2an/2016064

Classification : 35L81, 65M12, 35L65, 65M08
Keywords: All-Mach number scheme, Lagrange-projection scheme, asymptotic preserving scheme, stability analysis