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Séminaire de Calcul Scientifique et Modélisation

Convex limiting and entropy fixes for finite element discretizations of nonlinear hyperbolic problems

Dmitri Kuzmin

( Université de Dortmund )

Salle 2

le 20 juin 2024 à 14:00

This talk presents a family of algebraically constrained finite element schemes for hyperbolic conservation laws. The validity of generalized discrete maximum principles is enforced using monolithic convex limiting (MCL), a new flux correction procedure based on representation of spatial semi-discretizations in terms of admissible intermediate states. Semi-discrete entropy stability is enforced using a limiter-based fix. Time integration is performed using explicit or implicit Runge-Kutta methods, which can also be equipped with property-preserving flux limiters. In MCL schemes for nonlinear systems, problem-dependent inequality constraints are imposed on scalar functions of conserved variables to ensure physical and numerical admissibility of approximate solutions. After explaining the design philosophy behind our flux-corrected finite element approximations and showing some numerical examples, we turn to the analysis of consistency and convergence. For the Euler equations of gas dynamics, we prove weak convergence to a dissipative weak solution. The convergence analysis to be presented in this talk is joint work with Maria Lukáčová-Medvid’ová and Philipp Öffner.