Applied Mathematics and Mechanics (English Edition) ›› 2021, Vol. 42 ›› Issue (3): 405-424.doi: https://doi.org/10.1007/s10483-021-2712-8

• 论文 • 上一篇    下一篇

New optimized flux difference schemes for improving high-order weighted compact nonlinear scheme with applications

Shichao ZHENG, Xiaogang DENG, Dongfang WANG   

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2020-10-14 修回日期:2020-12-30 发布日期:2021-02-23
  • 通讯作者: Dongfang WANG E-mail:dfwang@nudt.edu.cn
  • 基金资助:
    Project supported by the National Key Project (No. GJXM92579) and the Defense Industrial Technology Development Program (No. C1520110002) by the State Administration of Science, Technology and Industry for National Defence, China

New optimized flux difference schemes for improving high-order weighted compact nonlinear scheme with applications

Shichao ZHENG, Xiaogang DENG, Dongfang WANG   

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2020-10-14 Revised:2020-12-30 Published:2021-02-23
  • Contact: Dongfang WANG E-mail:dfwang@nudt.edu.cn
  • Supported by:
    Project supported by the National Key Project (No. GJXM92579) and the Defense Industrial Technology Development Program (No. C1520110002) by the State Administration of Science, Technology and Industry for National Defence, China

摘要: To improve the spectral characteristics of the high-order weighted compact nonlinear scheme (WCNS), optimized flux difference schemes are proposed. The disadvantages in previous optimization routines, i.e., reducing formal orders, or extending stencil widths, are avoided in the new optimized schemes by utilizing fluxes from both cell-edges and cell-nodes. Optimizations are implemented with Fourier analysis for linear schemes and the approximate dispersion relation (ADR) for nonlinear schemes. Classical difference schemes are restored near discontinuities to suppress numerical oscillations with use of a shock sensor based on smoothness indicators. The results of several benchmark numerical tests indicate that the new optimized difference schemes outperform the classical schemes, in terms of accuracy and resolution for smooth wave and vortex, especially for long-time simulations. Using optimized schemes increases the total CPU time by less than 4%.

关键词: optimization, flux difference, weighted compact nonlinear scheme (WCNS), resolution, spectral error

Abstract: To improve the spectral characteristics of the high-order weighted compact nonlinear scheme (WCNS), optimized flux difference schemes are proposed. The disadvantages in previous optimization routines, i.e., reducing formal orders, or extending stencil widths, are avoided in the new optimized schemes by utilizing fluxes from both cell-edges and cell-nodes. Optimizations are implemented with Fourier analysis for linear schemes and the approximate dispersion relation (ADR) for nonlinear schemes. Classical difference schemes are restored near discontinuities to suppress numerical oscillations with use of a shock sensor based on smoothness indicators. The results of several benchmark numerical tests indicate that the new optimized difference schemes outperform the classical schemes, in terms of accuracy and resolution for smooth wave and vortex, especially for long-time simulations. Using optimized schemes increases the total CPU time by less than 4%.

Key words: optimization, flux difference, weighted compact nonlinear scheme (WCNS), resolution, spectral error

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