Open AccessReformulation of 2D DG2 Scheme for Shallow Water Modelling
Author(s) -
Janice Lynn Ayog,
Georges Kesserwani
Publication year - 2018
Publication title -
epic series in engineering
Language(s) - English
Resource type - Conference proceedings
ISSN - 2516-2330
DOI - 10.29007/xlvx
Subject(s) - discontinuous galerkin method , robustness (evolution) , stencil , shallow water equations , mathematics , scheme (mathematics) , computer science , basis (linear algebra) , mathematical optimization , mathematical analysis , finite element method , geometry , engineering , biochemistry , chemistry , computational science , structural engineering , gene
This paper presents a reformulation of the 2D second-order discontinuous Galerkin scheme (2D DG2) which is more efficient and stable for realistic simulation of hydrodynamics. This modified scheme is formulated based on a local linear solution spanned by a set of local coefficients using a newly proposed cell stencil. The results show that the reformulated second-order discontinuous Galerkin scheme performs acceptably well in predicting shock propagation. The modified scheme is designed to be conservative not only for the average coefficients but also the slope coefficients, which is necessary to ensure robustness based on the well-balanced property under the lake at rest hypothesis. Our preliminary findings reveal a great potential from adopting the proposed 2D DG2 reformulation as a basis for real-world flood modelling applications.