Moment-based multi-resolution HWENO scheme for hyperbolic conservation laws

TL;DR

This paper introduces a high-order, moment-based multi-resolution HWENO scheme for hyperbolic conservation laws that improves stability and resolution near discontinuities while maintaining a compact stencil and high accuracy.

Contribution

The paper develops a novel moment-based multi-resolution HWENO scheme that simplifies reconstruction, enhances stability, and maintains high accuracy with a compact stencil for hyperbolic conservation laws.

Findings

The scheme achieves high-order accuracy with a compact stencil.

It improves stability and resolution near discontinuities.

The CFL number can be as high as 0.6 for both 1D and 2D cases.

Abstract

In this paper, a high-order moment-based multi-resolution Hermite weighted essentially non-oscillatory (HWENO) scheme is designed for hyperbolic conservation laws. The main idea of this scheme is derived from our previous work [J. Comput. Phys., 446 (2021) 110653], in which the integral averages of the function and its first order derivative are used to reconstruct both the function and its first order derivative values at the boundaries. However, in this paper, only the function values at the Gauss-Lobatto points in the one or two dimensional case need to be reconstructed by using the information of the zeroth and first order moments. In addition, an extra modification procedure is used to modify those first order moments in the troubled-cells, which leads to an improvement of stability and an enhancement of resolution near discontinuities. To obtain the same order of accuracy, the size of the stencil required by this moment-based multi-resolution HWENO scheme is still the same as the general HWENO scheme and is more compact than the general WENO scheme. Moreover, the linear weights can also be any positive numbers as long as their sum equals one and the CFL number can still be 0.6 whether for the one or two dimensional case. Extensive numerical examples are given to demonstrate the stability and resolution of such moment-based multi-resolution HWENO scheme.