2024/11/18 by Lidan Zhao, Zhao, Lidan, Zhanjing Tao +3
Earth and Planetary Sciences · Engineering · Mathematics · #Applied mathematics #Arithmetic #Computational Fluid Dynamics and Aerodynamics #Computer science #Constant (computer programming) #Economics #FOS: Mathematics #Finite volume method #Mathematical analysis #Mathematics #Mechanics #Meteorological Phenomena and Simulations #Numerical Analysis (math.NA) #Ocean Waves and Remote Sensing #Order (exchange) #Physics #Shallow water equations #Subtraction #Thermodynamics #Volume (thermodynamics)
paper · pdf · doi:10.48550/arxiv.2411.11241
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2024/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this paper, we propose a new well-balanced fifth-order finite volume WENO method for solving one- and two-dimensional shallow water equations with bottom topography. The well-balanced property is crucial to the ability of a scheme to simulate perturbation waves over the ``lake-at-rest'' steady state such as waves on a lake or tsunami waves in the deep ocean. We adopt the constant subtraction technique such that both the flux gradient and source term in the new pre-balanced form vanish at the lake-at-rest steady state, while the well-balanced WENO method by Xing and Shu [Commun. Comput. Phys., 2006] uses high-order accurate numerical discretization of the source term and makes the exact balance between the source term and the flux gradient, to achieve the well-balanced property. The scaling positivity-preserving limiter is used for the water height near the dry areas. The fifth-order WENO-AO reconstruction is used to construct the solution since it has better resolution than the WENO-ZQ and WENO-MR reconstructions for the perturbation of steady state flows. Extensive one- and two-dimensional numerical examples are presented to demonstrate the well-balanced, fifth-order accuracy, non-oscillatory, and positivity-preserving properties of the proposed method.