Comparison of numerical methods for the nonlinear Klein-Gordon equation in the nonrelativistic limit regime

W Bao, X Zhao - Journal of Computational Physics, 2019 - Elsevier
Different efficient and accurate numerical methods have recently been proposed and
analyzed for the nonlinear Klein-Gordon equation (NKGE) with a dimensionless parameter …

Geometric two-scale integrators for highly oscillatory system: uniform accuracy and near conservations

B Wang, X Zhao - SIAM Journal on Numerical Analysis, 2023 - SIAM
In this paper, we consider a class of highly oscillatory Hamiltonian systems which involve a
scaling parameter. The problem arises from many physical models in some limit parameter …

Uniformly accurate methods for three dimensional Vlasov equations under strong magnetic field with varying direction

P Chartier, N Crouseilles, M Lemou, F Méhats… - SIAM Journal on …, 2020 - SIAM
In this paper, we consider the three dimensional Vlasov equation with an inhomogeneous,
varying direction, strong magnetic field. Whenever the magnetic field has constant intensity …

Derivative-free high-order uniformly accurate schemes for highly oscillatory systems

P Chartier, M Lemou, F Méhats… - IMA Journal of Numerical …, 2022 - academic.oup.com
In this paper we address the computational aspects of uniformly accurate numerical
methods for solving highly oscillatory evolution equations. In particular, we introduce an …

Uniform Error Bounds of an Exponential Wave Integrator for the Long-Time Dynamics of the Nonlinear Klein--Gordon Equation

Y Feng, W Yi - Multiscale Modeling & Simulation, 2021 - SIAM
We establish uniform error bounds of an exponential wave integrator Fourier pseudospectral
(EWI-FP) method for the long-time dynamics of the nonlinear Klein--Gordon equation …

On the uniform accuracy of implicit-explicit backward differentiation formulas (IMEX-BDF) for stiff hyperbolic relaxation systems and kinetic equations

J Hu, R Shu - Mathematics of Computation, 2021 - ams.org
Many hyperbolic and kinetic equations contain a non-stiff convection/transport part and a stiff
relaxation/collision part (characterized by the relaxation or mean free time $\varepsilon $) …

Time multiscale modeling of sorption kinetics I: uniformly accurate schemes for highly oscillatory advection-diffusion equation

C Astuto, M Lemou, G Russo - arxiv preprint arxiv:2307.14001, 2023 - arxiv.org
In this paper we propose a numerical method to solve a 2D advection-diffusion equation, in
the highly oscillatory regime. We use an efficient and robust integrator which leads to an …

A class of linearly implicit energy-preserving schemes for conservative systems

X Li, B Wang, X Zou - Journal of Mathematical Analysis and Applications, 2024 - Elsevier
We consider a kind of differential equations y˙(t)= R (y (t)) y (t)+ f (y (t)) with energy
conservation. Such conservative models appear for instance in quantum physics …

On time-splitting methods for nonlinear Schrödinger equation with highly oscillatory potential

C Su, X Zhao - ESAIM: Mathematical Modelling and Numerical …, 2020 - esaim-m2an.org
In this work, we consider the numerical solution of the nonlinear Schrödinger equation with a
highly oscillatory potential (NLSE-OP). The NLSE-OP is a model problem which frequently …

[PDF][PDF] On comparison of asymptotic expansion techniques for nonlinear Klein-Gordon equation in the nonrelativistic limit regime.

K Schratz, X Zhao - … & Continuous Dynamical Systems-Series B, 2020 - researchgate.net
This work concerns the time averaging techniques for the nonlinear Klein-Gordon (KG)
equation in the nonrelativistic limit regime which have recently gained a lot of attention in …