Applied Mathematics and Mechanics (English Edition) ›› 2016, Vol. 37 ›› Issue (1): 1-14.doi: https://doi.org/10.1007/s10483-016-2051-9

• 论文 •    下一篇

Constrained Hamilton variational principle for shallow water problems and Zu-class symplectic algorithm

Feng WU, Wanxie ZHONG   

  1. State Key Laboratory of Structural Analysis of Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116023, Liaoning Province, China
  • 收稿日期:2015-10-06 修回日期:2015-11-02 出版日期:2016-01-01 发布日期:2016-01-01
  • 通讯作者: Wanxie ZHONG E-mail:zwx34224@163.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (No. 11472067)

Constrained Hamilton variational principle for shallow water problems and Zu-class symplectic algorithm

Feng WU, Wanxie ZHONG   

  1. State Key Laboratory of Structural Analysis of Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116023, Liaoning Province, China
  • Received:2015-10-06 Revised:2015-11-02 Online:2016-01-01 Published:2016-01-01
  • Contact: Wanxie ZHONG E-mail:zwx34224@163.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 11472067)

摘要:

In this paper, the shallow water problem is discussed. By treating the incompressible condition as the constraint, a constrained Hamilton variational principle is presented for the shallow water problem. Based on the constrained Hamilton variational principle, a shallow water equation based on displacement and pressure (SWE-DP) is developed. A hybrid numerical method combining the finite element method for spatial discretization and the Zu-class method for time integration is created for the SWEDP. The correctness of the proposed SWE-DP is verified by numerical comparisons with two existing shallow water equations (SWEs). The effectiveness of the hybrid numerical method proposed for the SWE-DP is also verified by numerical experiments. Moreover, the numerical experiments demonstrate that the Zu-class method shows excellent performance with respect to simulating the long time evolution of the shallow water.

关键词: shallow water equation (SWE), constrained Hamilton variational principle, Zu-class method

Abstract:

In this paper, the shallow water problem is discussed. By treating the incompressible condition as the constraint, a constrained Hamilton variational principle is presented for the shallow water problem. Based on the constrained Hamilton variational principle, a shallow water equation based on displacement and pressure (SWE-DP) is developed. A hybrid numerical method combining the finite element method for spatial discretization and the Zu-class method for time integration is created for the SWEDP. The correctness of the proposed SWE-DP is verified by numerical comparisons with two existing shallow water equations (SWEs). The effectiveness of the hybrid numerical method proposed for the SWE-DP is also verified by numerical experiments. Moreover, the numerical experiments demonstrate that the Zu-class method shows excellent performance with respect to simulating the long time evolution of the shallow water.

Key words: Zu-class method, constrained Hamilton variational principle, shallow water equation (SWE)

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