Akademik Veri Yönetim Sistemi
Communications Faculty of Sciences University of Ankara Series A1: Mathematics and Statistics, cilt.69, sa.1, ss.213-231, 2020 (ESCI, TRDizin)
The main purpose of this paper is to describe a space-time dis- continuous Galerkin (DG) method based on an extended space-time approx- imation space for the linear Örst order hyperbolic equation that contains a high frequency component. We extend the space-time DG spaces of tensor- product of polynomials by adding trigonometric functions in space and time that capture the oscillatory behavior of the solution. We construct the method by combining the basic framework of the space-time DG method with the ex- tended Önite element method. The basic principle of the method is integrating the features of the partial di§erential equation with the standard space-time spaces in the approximation. We present error analysis of the proposed space- time DG method for the linear Örst order hyperbolic problems. We show that the new space-time DG approximation has an improvement in the convergence compared to the space-time DG schemes with tensor-product polynomials. Nu- merical examples verify the theoretical Öndings and demonstrate the e§ects of the proposed method.