Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2019, Vol. 42 ›› Issue (5): 8-14.doi: 10.13190/j.jbupt.2019-023

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Implicit Overrelaxation LU-SGS Discontinuous Galerkin Finite Element Algorithm

DUAN Zhi-jian1,2, XIE Gong-nan3, ZHANG Ying-chun1   

  1. 1. School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
    2. School of Mathematics and Information Science, Xianyang Normal University, Xianyang 712000, China;
    3. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2019-03-01 Online:2019-10-28 Published:2019-11-25

Abstract: In order to improve the computational efficiency of solving Euler equation and Navier-Stokes equation, the discontinuous Galerkin finite element method was investigated by combining with the implicit time discrete scheme. The lower upper-symmetric Gauss-Seidel(LU-SGS) scheme was improved through retaining the round-off error item, and an overrelaxation interior iteration LU-SGS discrete scheme was constructed to realize the calculation of unsteady compressible flow fields. The reliability and accuracy of the algorithm were verified by solving the Sod shock tube problem and the two-dimensional pipeline problem. The transonic compressible flows around RAE2822 airfoil and ONERA M6 wing were numerically calculated, and the results were compared with that of the multistep Runge-Kutta(RK) algorithm, LU-SGS algorithm and generalized minimal residual algorithms(GMRES). The results show that the presented algorithm has good stability and efficiency, and its computational efficiency is 2.35~3.1 times that of LU-SGS scheme and 5.4 times that of RK scheme.

Key words: implicit time discrete algorithm, Euler equation, lower upper-symmetric Gauss-Seidel scheme, discontinuous Galerkin finite element method

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