Locally Limited and Fully Conserved RKDG2 Shallow Water Solutions with Wetting and Drying

Authors:
Georges Kesserwani;Qiuhua Liang
Affiliations:
School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, England, UK NE1 7RU;School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, England, UK NE1 7RU
Venue:
Journal of Scientific Computing
Year:
2012

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Abstract

This work extends a well-balanced second-order Runge-Kutta discontinuous Galerkin (RKDG2) scheme to provide conservative simulations for shallow flows involving wetting and drying over irregular topographies with friction effects. For this purpose, a wetting and drying technique designed originally for a finite volume (FV) scheme is improved and implemented, which includes the discretization of friction source terms via a splitting implicit integration approach. Another focus of this work is to design a fully conserved RKDG2 scheme to provide conservative solutions for both mass and momentum through a local slope limiting process. Several steady and transient benchmark tests with/without friction effects are simulated to validate the new solver and demonstrate the effects of different slope limiting processes, i.e. globally and locally slope limiting processes.