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arXiv 2409.09600math.NAcs.NAphysics.ao-phphysics.comp-phphysics.flu-dyn
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自适应运动网格上浅水方程的高阶精度保结构有限体积格式:良平衡性与正性

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

Zhihao Zhang, Huazhong Tang, Kailiang Wu

AI总结:

针对自适应运动网格上的浅水方程,提出将良平衡性分解为通量源平衡与网格运动平衡的高阶保正有限体积格式,并严格证明其WB与PP性质。

摘要:

本文针对自适应运动结构化网格上的浅水方程,发展了高阶精度、良平衡(WB)且保持正性(PP)的有限体积格式。网格运动给维持WB性质带来了新的挑战:该性质不仅取决于通量梯度与源项之间的平衡,还受到网格运动的影响。为应对这些复杂性,曲线坐标中的WB性质被分解为通量源平衡和网格运动平衡。通量源平衡通过适当分解源项、基于静水重构的数值通量以及对几何守恒律(GCLs)的恰当离散来实现;同时,网格运动平衡通过在网格调整期间集成额外格式以更新底部地形来维持。借助离散GCLs和这两种平衡,所提格式被严格证明能够维持WB性质。在由PP限制器强制满足的一个充分条件下,我们对PP性质给出了严格分析。由于涉及网格度量和运动,这些分析并不平凡,而一些标准技术——例如将高阶格式拆分为形式上一阶PP格式的凸组合——无法直接适用。多个数值算例验证了所提格式的高阶精度、高效率以及WB和PP性质。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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