Structure-Preserving Oscillation-Eliminating Discontinuous Galerkin Schemes for Ideal MHD Equations: Locally Divergence-Free and Positivity-Preserving
arxiv(2024)
摘要
This paper develops structure-preserving, oscillation-eliminating
discontinuous Galerkin (OEDG) schemes for ideal magnetohydrodynamics (MHD), as
a sequel to our recent work [Peng, Sun, and Wu, OEDG: Oscillation-eliminating
discontinuous Galerkin method for hyperbolic conservation laws, 2023]. The
schemes are based on a locally divergence-free (LDF) oscillation-eliminating
(OE) procedure to suppress spurious oscillations while maintaining many of the
good properties of original DG schemes, such as conservation, local
compactness, and optimal convergence rates. The OE procedure is built on the
solution operator of a novel damping equation – a simple linear ordinary
differential equation (ODE) whose exact solution can be exactly formulated.
Because this OE procedure does not interfere with DG spatial discretization and
RK stage update, it can be easily incorporated to existing DG codes as an
independent module. These features make the proposed LDF OEDG schemes highly
efficient and easy to implement.In addition, we present a positivity-preserving
(PP) analysis of the LDF OEDG schemes on Cartesian meshes via the optimal
convex decomposition technique and the geometric quasi-linearization (GQL)
approach. Efficient PP LDF OEDG schemes are obtained with the HLL flux under a
condition accessible by the simple local scaling PP limiter.Several one- and
two-dimensional MHD tests confirm the accuracy, effectiveness, and robustness
of the proposed structure-preserving OEDG schemes.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要