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A Multi-Domain Hybrid DG and WENO Method for Hyperbolic Conservation Laws on Hybrid Meshes

Published online by Cambridge University Press:  03 June 2015

Jian Cheng  and
Tiegang Liu
Jian Cheng*
Affiliation:
LMIB, School of Mathematics and Systems Science, Beihang University, Beijing 100191, P.R. China
Tiegang Liu*
Affiliation:
LMIB, School of Mathematics and Systems Science, Beihang University, Beijing 100191, P.R. China
*
Email:chengjian@smss.buaa.edu.cn
Corresponding author.Email:liutg@buaa.edu.cn
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Abstract

In [SIAM J. Sci. Comput., 35(2)(2013), A1049-A1072], a class of multi-domain hybrid DG and WENO methods for conservation laws was introduced. Recent applications of this method showed that numerical instability may encounter if the DG flux with Lagrangian interpolation is applied as the interface flux during the moment of conservative coupling. In this continuation paper, we present a more robust approach in the construction of DG flux at the coupling interface by using WENO procedures of reconstruction. Based on this approach, such numerical instability is overcome very well. In addition, the procedure of coupling a DG method with a WENO-FD scheme on hybrid meshes is disclosed in detail. Typical testing cases are employed to demonstrate the accuracy of this approach and the stability under the flexibility of using either WENO-FD flux or DG flux at the moment of requiring conservative coupling.

Keywords

65M6065M9935L65Discontinuous Galerkin methodweighted essentially nonoscillatory schemehybrid methodconservation laws
Type
Research Article
Information
Communications in Computational Physics , Volume 16 , Issue 4 , October 2014 , pp. 1116 - 1134
Copyright
Copyright © Global Science Press Limited 2014

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