Affiliation of Author(s):理学院
Journal:COMMUNICATIONS IN COMPUTATIONAL PHYSICS
Key Words:Runge-Kutta discontinuous Galerkin method HWENO limiter unstructured mesh
Abstract:In this paper we generalize a new type of compact Hermite weighted essentially non-oscillatory (HWENO) limiter for the Runge-Kutta discontinuous Galerkin (RKDG) method, which was recently developed in [38] for structured meshes, to two dimensional unstructured meshes. The main idea of this HWENO limiter is to reconstruct the new polynomial by the usage of the entire polynomials of the DG solution from the target cell and its neighboring cells in a least squares fashion [11] while maintaining the conservative property, then use the classical WENO methodology to form a convex combination of these reconstructed polynomials based on the smoothness indicators and associated nonlinear weights. The main advantage of this new HWENO limiter is the robustness for very strong shocks and simplicity in implementation especially for the unstructured meshes considered in this paper, since only information from the target cell and its immediate neighbors is needed. Numerical results for both scalar and system equations are provided to test and verify the good performance of this new limiter.
ISSN No.:1815-2406
Translation or Not:no
Date of Publication:2017-03-01
Co-author:Zhong, Xinghui,Shu, Chi-Wang,Qiu, Jianxian
Correspondence Author:Qiu, Jianxian,zzz
Date of Publication:2017-03-01