2024/01/12 by Benjamin Dörich, Dörich, Benjamin, Vanja Nikolić +1
Earth and Planetary Sciences · Engineering · Mathematics · #35L72 #65M12 #65M15 #65M60 #FOS: Mathematics #Numerical Analysis (math.NA) #Numerical methods in inverse problems #Seismic Imaging and Inversion Techniques #Stability and Controllability of Differential Equations
paper · pdf · doi:10.48550/arxiv.2401.06492
openalex publication_date 2024/01/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
The Kuznetsov equation is a classical wave model of acoustics that incorporates quadratic gradient nonlinearities. When its strong damping vanishes, it undergoes a singular behavior change, switching from a parabolic-like to a hyperbolic quasilinear evolution. In this work, we establish for the first time the optimal error bounds for its finite element approximation as well as a semi-implicit fully discrete approximation that are robust with respect to the vanishing damping parameter. The core of the new arguments lies in devising energy estimates directly for the error equation where one can more easily exploit the polynomial structure of the nonlinearities and compensate inverse estimates with smallness conditions on the error. Numerical experiments are included to illustrate the theoretical results.