Communications on Applied Mathematics and Computation ›› 2025, Vol. 7 ›› Issue (2): 796-826.doi: 10.1007/s42967-024-00391-0

• ORIGINAL PAPERS • 上一篇    

Inverse Lax-Wendroff Boundary Treatment of Discontinuous Galerkin Method for 1D Conservation Laws

Lei Yang1, Shun Li1, Yan Jiang1, Chi-Wang Shu2, Mengping Zhang1   

  1. 1 School of Mathematical Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China;
    2 Division of Applied Mathematics, Brown University, Providence, RI 02912, USA
  • 收稿日期:2023-09-30 修回日期:2024-01-23 接受日期:2024-02-21 出版日期:2025-06-20 发布日期:2025-04-21
  • 通讯作者: Mengping Zhang,mpzhang@ustc.edu.cn;Lei Yang,ylcg@mail.ustc.edu.cn;Shun Li,lishun@mail.ustc.edu.cn;Yan Jiang,jiangy@ustc.edu.cn;Chi-Wang Shu,chi-wang_shu@brown.edu; E-mail:mpzhang@ustc.edu.cn;ylcg@mail.ustc.edu.cn;lishun@mail.ustc.edu.cn;jiangy@ustc.edu.cn;chi-wang_shu@brown.edu;

Inverse Lax-Wendroff Boundary Treatment of Discontinuous Galerkin Method for 1D Conservation Laws

Lei Yang1, Shun Li1, Yan Jiang1, Chi-Wang Shu2, Mengping Zhang1   

  1. 1 School of Mathematical Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China;
    2 Division of Applied Mathematics, Brown University, Providence, RI 02912, USA
  • Received:2023-09-30 Revised:2024-01-23 Accepted:2024-02-21 Online:2025-06-20 Published:2025-04-21

摘要: In this paper, we propose a new class of discontinuous Galerkin (DG) methods for solving 1D conservation laws on unfitted meshes. The standard DG method is used in the interior cells. For the small cut elements around the boundaries, we directly design approximation polynomials based on inverse Lax-Wendroff (ILW) principles for the inflow boundary conditions and introduce the post-processing to preserve the local conservation properties of the DG method. The theoretical analysis shows that our proposed methods have the same stability and numerical accuracy as the standard DG method in the inner region. An additional nonlinear limiter is designed to prevent spurious oscillations if a shock is near the boundary. Numerical results indicate that our methods achieve optimal numerical accuracy for smooth problems and do not introduce additional oscillations in discontinuous problems.

关键词: Discontinuous Galerkin (DG) method, Hyperbolic conservation laws, Numerical boundary conditions, Inverse Lax-Wendroff (ILW) method, High-order accuracy, Stability analysis

Abstract: In this paper, we propose a new class of discontinuous Galerkin (DG) methods for solving 1D conservation laws on unfitted meshes. The standard DG method is used in the interior cells. For the small cut elements around the boundaries, we directly design approximation polynomials based on inverse Lax-Wendroff (ILW) principles for the inflow boundary conditions and introduce the post-processing to preserve the local conservation properties of the DG method. The theoretical analysis shows that our proposed methods have the same stability and numerical accuracy as the standard DG method in the inner region. An additional nonlinear limiter is designed to prevent spurious oscillations if a shock is near the boundary. Numerical results indicate that our methods achieve optimal numerical accuracy for smooth problems and do not introduce additional oscillations in discontinuous problems.

Key words: Discontinuous Galerkin (DG) method, Hyperbolic conservation laws, Numerical boundary conditions, Inverse Lax-Wendroff (ILW) method, High-order accuracy, Stability analysis

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