Applied Mathematics and Mechanics (English Edition) ›› 2015, Vol. 36 ›› Issue (8): 1073-1090.doi: https://doi.org/10.1007/s10483-015-1964-7

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Direct spectral domain decomposition method for 2D incompressible Navier-Stokes equations

Benwen LI1, Shangshang CHEN2   

  1. 1. Institute of Thermal Engineering, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China;
    2. Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education), Northeastern University, Shenyang 110819, China
  • 收稿日期:2014-12-24 修回日期:2015-05-22 出版日期:2015-08-01 发布日期:2015-08-01
  • 通讯作者: Benwen LI E-mail:heatli@dlut.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (No. 51176026) and the Fundamental Research Funds for the Central Universities (No.DUT14RC(3)029)

Direct spectral domain decomposition method for 2D incompressible Navier-Stokes equations

Benwen LI1, Shangshang CHEN2   

  1. 1. Institute of Thermal Engineering, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China;
    2. Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education), Northeastern University, Shenyang 110819, China
  • Received:2014-12-24 Revised:2015-05-22 Online:2015-08-01 Published:2015-08-01
  • Contact: Benwen LI E-mail:heatli@dlut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (No. 51176026) and the Fundamental Research Funds for the Central Universities (No.DUT14RC(3)029)

摘要: An efficient direct spectral domain decomposition method is developed coupled with Chebyshev spectral approximation for the solution of 2D, unsteady and incompressible Navier-Stokes equations in complex geometries. In this numerical approach, the spatial domains of interest are decomposed into several non-overlapping rectangular sub-domains. In each sub-domain, an improved projection scheme with second-order accuracy is used to deal with the coupling of velocity and pressure, and the Chebyshev collocation spectral method (CSM) is adopted to execute the spatial discretization. The influence matrix technique is employed to enforce the continuities of both variables and their normal derivatives between the adjacent sub-domains. The imposing of the Neumann boundary conditions to the Poisson equations of pressure and intermediate variable will result in the indeterminate solution. A new strategy of assuming the Dirichlet boundary conditions on interface and using the first-order normal derivatives as transmission conditions to keep the continuities of variables is proposed to overcome this trouble. Three test cases are used to verify the accuracy and efficiency, and the detailed comparison between the numerical results and the available solutions is done. The results indicate that the present method is efficiency, stability, and accuracy.

关键词: domain decomposition, influence matrix technique, Chebyshev collocation spectral method, incompressible Navier-Stokes equation

Abstract: An efficient direct spectral domain decomposition method is developed coupled with Chebyshev spectral approximation for the solution of 2D, unsteady and incompressible Navier-Stokes equations in complex geometries. In this numerical approach, the spatial domains of interest are decomposed into several non-overlapping rectangular sub-domains. In each sub-domain, an improved projection scheme with second-order accuracy is used to deal with the coupling of velocity and pressure, and the Chebyshev collocation spectral method (CSM) is adopted to execute the spatial discretization. The influence matrix technique is employed to enforce the continuities of both variables and their normal derivatives between the adjacent sub-domains. The imposing of the Neumann boundary conditions to the Poisson equations of pressure and intermediate variable will result in the indeterminate solution. A new strategy of assuming the Dirichlet boundary conditions on interface and using the first-order normal derivatives as transmission conditions to keep the continuities of variables is proposed to overcome this trouble. Three test cases are used to verify the accuracy and efficiency, and the detailed comparison between the numerical results and the available solutions is done. The results indicate that the present method is efficiency, stability, and accuracy.

Key words: Chebyshev collocation spectral method, domain decomposition, influence matrix technique, incompressible Navier-Stokes equation

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