A class of adaptive multiresolution ultra-weak discontinuous Galerkin methods for some nonlinear dispersive wave equations

TL;DR

This paper introduces adaptive multiresolution ultra-weak discontinuous Galerkin methods tailored for nonlinear dispersive wave equations like KdV and ZK, demonstrating stability, accuracy, and efficiency in capturing solitary waves.

Contribution

It develops a new UWDG formulation for ZK equations with mixed derivatives and establishes stability and error estimates, advancing numerical methods for dispersive wave equations.

Findings

Methods accurately capture solitary wave structures.

Proven $L^2$ stability and optimal error estimates.

Numerical examples demonstrate high accuracy and efficiency.

Abstract

In this paper, we propose a class of adaptive multiresolution (also called adaptive sparse grid) ultra-weak discontinuous Galerkin (UWDG) methods for solving some nonlinear dispersive wave equations including the Korteweg-de Vries (KdV) equation and its two dimensional generalization, the Zakharov-Kuznetsov (ZK) equation. The UWDG formulation, which relies on repeated integration by parts, was proposed for KdV equation in \cite{cheng2008discontinuous}. For the ZK equation which contains mixed derivative terms, we develop a new UWDG formulation. The $L^2$ stability and the optimal error estimate with a novel local projection are established for this new scheme on regular meshes. Adaptivity is achieved based on multiresolution and is particularly effective for capturing solitary wave structures. Various numerical examples are presented to demonstrate the accuracy and capability of our methods.