High-order accurate structure-preserving finite volume schemes on adaptive moving meshes for shallow water equations: well-balancedness and positivity

作     者：Zhang, Zhihao Tang, Huazhong Wu, Kailiang 

作者机构：Center for Applied Physics and Technology HEDPS and LMAM School of Mathematical Sciences Peking University Beijing100871 China Nanchang Hangkong University Jiangxi Province Nanchang330000 China Department of Mathematics Shenzhen International Center for Mathematics Southern University of Science and Technology Guangdong Shenzhen518055 China Guangdong Provincial Key Laboratory of Computational Science and Material Design Shenzhen518055 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Mesh generation 

摘      要：This paper develops high-order accurate, well-balanced (WB), and positivity-preserving (PP) finite volume schemes for shallow water equations on adaptive moving structured meshes. The mesh movement poses new challenges in maintaining the WB property, which not only depends on the balance between flux gradients and source terms but is also affected by the mesh movement. To address these complexities, the WB property in curvilinear coordinates is decomposed into flux source balance and mesh movement balance. The flux source balance is achieved by suitable decomposition of the source terms, the numerical fluxes based on hydrostatic reconstruction, and appropriate discretization of the geometric conservation laws (GCLs). Concurrently, the mesh movement balance is maintained by integrating additional schemes to update the bottom topography during mesh adjustments. The proposed schemes are rigorously proven to maintain the WB property by using the discrete GCLs and these two balances. We provide rigorous analyses of the PP property under a sufficient condition enforced by a PP limiter. Due to the involvement of mesh metrics and movement, the analyses are nontrivial, while some standard techniques, such as splitting high-order schemes into convex combinations of formally first-order PP schemes, are not directly applicable. Various numerical examples validate the high-order accuracy, high efficiency, WB, and PP properties of the proposed schemes. Copyright © 2024, The Authors. All rights reserved.