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Stabilization and Limiting Techniques for Galerkin Approximations of Hyperbolic Conservation Laws With High Order Finite Elements

Subject Area Mathematics
Term from 2017 to 2024
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 387630025
 
Final Report Year 2024

Final Report Abstract

The ambition of this research project was to develop a new generation of physics-compatible high-resolution finite element schemes for nonlinear hyperbolic problems. In this context, failure to suppress spurious oscillations and satisfy appropriate constraints may result in numerical instabilities and nonphysical artifacts. The framework of monolithic convex limiting (MCL) developed in this project makes it possible to ensure preservation of invariant domains (i.e., positivity preservation for quasi-concave functions of conserved variables) and validity of local discrete maximum principles for scalar quantities of interest. Limiter-based algebraic fixes were designed for enforcing entropy stability conditions in semi-discrete and fully discrete schemes. Property-preserving time discretization limiters were developed for intermediate and final stages of high-order Runge-Kutta methods. The difficult task of achieving optimal accuracy and performance with continuous and discontinuous Galerkin discretizations of arbitrary high order was accomplished for nodal Bernstein and Legendre-Gauss-Lobatto (LGL) bases using localization to subcells and sparsification of discrete operators. Weighted essentially nonoscillatory (WENO) reconstructions were used to construct novel smoothness sensors for nonlinear stabilization terms. Very significant advances have also been made in the theoretical analysis of algebraic flux correction schemes. New a priori error estimates were derived for linear transport equations. The ability of each limiting technique to enforce the desired properties is guaranteed by a rigorous proof. The entropy stability of MCL-type finite element discretizations was exploited in proofs of Lax-Wendroff consistency and convergence to dissipative weak solutions of the compressible Euler equations. The main outcomes of the project were summarized and many new results were included in the book "Property-Preserving Numerical Schemes for Conservation Laws" (470 pages + supplementary materials) published by World Scientific in 2023.

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