Well-balanced fifth-order finite volume WENO schemes with constant subtraction technique for shallow water equations

TL;DR

This paper introduces a new fifth-order finite volume WENO scheme with a constant subtraction technique for shallow water equations, ensuring well-balanced, high accuracy, and positivity-preserving solutions over steady states like lakes or tsunamis.

Contribution

The paper develops a novel well-balanced fifth-order WENO scheme using constant subtraction, improving accuracy and stability in simulating shallow water flows with complex topography.

Findings

Achieves fifth-order accuracy in shallow water simulations.

Maintains well-balanced property for lake-at-rest states.

Demonstrates robustness near dry areas with positivity preservation.

Abstract

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.