Relaxation exponential Rosenbrock-type methods for oscillatory Hamiltonian systems

D Li, X Li - SIAM Journal on Scientific Computing, 2023 - SIAM
It is challenging to numerically solve oscillatory Hamiltonian systems due to the stiffness of
the problems and the requirement of highly stable and energy-preserving schemes. The …

Implicit-explicit relaxation Runge-Kutta methods: construction, analysis and applications to PDEs

D Li, X Li, Z Zhang - Mathematics of Computation, 2023 - ams.org
Spatial discretizations of time-dependent partial differential equations usually result in a
large system of semi-linear and stiff ordinary differential equations. Taking the structures into …

High order entropy preserving ADER-DG schemes

E Gaburro, P Öffner, M Ricchiuto, D Torlo - Applied Mathematics and …, 2023 - Elsevier
In this paper, we develop a fully discrete entropy preserving ADER-Discontinuous Galerkin
(ADER-DG) method. To obtain this desired result, we equip the space part of the method …

Linearly implicit and high-order energy-preserving relaxation schemes for highly oscillatory Hamiltonian systems

D Li, X Li, Z Zhang - Journal of Computational Physics, 2023 - Elsevier
In this paper, a family of novel energy-preserving schemes are presented for numerically
solving highly oscillatory Hamiltonian systems. These schemes are constructed by using the …

Reinterpretation and extension of entropy correction terms for residual distribution and discontinuous Galerkin schemes: application to structure preserving …

R Abgrall, P Öffner, H Ranocha - Journal of Computational Physics, 2022 - Elsevier
For the general class of residual distribution (RD) schemes, including many finite element
(such as continuous/discontinuous Galerkin) and flux reconstruction methods, an approach …

[HTML][HTML] Optimized Runge-Kutta methods with automatic step size control for compressible computational fluid dynamics

H Ranocha, L Dalcin, M Parsani… - … on Applied Mathematics …, 2022 - Springer
We develop error-control based time integration algorithms for compressible fluid dynamics
(CFD) applications and show that they are efficient and robust in both the accuracy-limited …

Relaxation deferred correction methods and their applications to residual distribution schemes

R Abgrall, É Le Mélédo, P Öffner, D Torlo - The SMAI Journal of …, 2022 - numdam.org
The Deferred Correction (DeC) methods combined with the residual distribution (RD)
approach allow the construction of high order continuous Galerkin (cG) schemes avoiding …

PottsMGNet: A mathematical explanation of encoder-decoder based neural networks

XC Tai, H Liu, R Chan - SIAM Journal on Imaging Sciences, 2024 - SIAM
For problems in image processing and many other fields, a large class of effective neural
networks has encoder-decoder-based architectures. Although these networks have shown …

Fully discrete explicit locally entropy-stable schemes for the compressible Euler and Navier–Stokes equations

H Ranocha, L Dalcin, M Parsani - Computers & Mathematics with …, 2020 - Elsevier
Recently, relaxation methods have been developed to guarantee the preservation of a
single global functional of the solution of an ordinary differential equation. Here, we …

A broad class of conservative numerical methods for dispersive wave equations

H Ranocha, D Mitsotakis, DI Ketcheson - arXiv preprint arXiv:2006.14802, 2020 - arxiv.org
We develop a general framework for designing conservative numerical methods based on
summation by parts operators and split forms in space, combined with relaxation Runge …