Applied Mathematics and Mechanics (English Edition) ›› 2019, Vol. 40 ›› Issue (6): 889-910.doi: https://doi.org/10.1007/s10483-019-2487-9

• 论文 • 上一篇    

Mixed finite element for two-dimensional incompressible convective Brinkman-Forchheimer equations

Demin LIU1, Kaitai LI2   

  1. 1. College of Mathematics and System Sciences, Xinjiang University, Urumqi 830046, China;
    2. School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2018-08-15 修回日期:2018-12-02 出版日期:2019-06-01 发布日期:2019-06-01
  • 通讯作者: Kaitai LI E-mail:followtime@126.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Nos. 11461068, 11362021, and 11401511) and the Doctoral Foundation of Xinjiang Uygur Autonomous Region of China (No. BS110101)

Mixed finite element for two-dimensional incompressible convective Brinkman-Forchheimer equations

Demin LIU1, Kaitai LI2   

  1. 1. College of Mathematics and System Sciences, Xinjiang University, Urumqi 830046, China;
    2. School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2018-08-15 Revised:2018-12-02 Online:2019-06-01 Published:2019-06-01
  • Contact: Kaitai LI E-mail:followtime@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos. 11461068, 11362021, and 11401511) and the Doctoral Foundation of Xinjiang Uygur Autonomous Region of China (No. BS110101)

摘要: In this work, the two-dimensional convective Brinkman-Forchheimer equations are considered. The well-posedness for the variational problem and its mixed finite element approximation is established, and the error estimates based on the conforming approximation are obtained. For the computation, a one-step Newton (or semi-Newton) iteration algorithm initialized using a fixed-point iteration is proposed. Finally, numerical experiments using a Taylor-Hood mixed element built on a structured or unstructured triangular mesh are implemented. The numerical results obtained using the algorithm are compared with the analytic data, and are shown to be in very good agreement. Moreover, the lid-driven problem at Reynolds numbers of 100 and 400 is considered and analyzed.

关键词: generalized variational principle, nonlinear structures, statically indeterminate structures, Newton iteration, Brinkman-Forchheimer equations, finite element method

Abstract: In this work, the two-dimensional convective Brinkman-Forchheimer equations are considered. The well-posedness for the variational problem and its mixed finite element approximation is established, and the error estimates based on the conforming approximation are obtained. For the computation, a one-step Newton (or semi-Newton) iteration algorithm initialized using a fixed-point iteration is proposed. Finally, numerical experiments using a Taylor-Hood mixed element built on a structured or unstructured triangular mesh are implemented. The numerical results obtained using the algorithm are compared with the analytic data, and are shown to be in very good agreement. Moreover, the lid-driven problem at Reynolds numbers of 100 and 400 is considered and analyzed.

Key words: generalized variational principle, nonlinear structures, statically indeterminate structures, Brinkman-Forchheimer equations, Newton iteration, finite element method

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