数学物理学报(英文版) ›› 2024, Vol. 44 ›› Issue (6): 2411-2421.doi: 10.1007/s10473-024-0619-8

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A BICUBIC B-SPLINE FINITE ELEMENT METHOD FOR FOURTH-ORDER SEMILINEAR PARABOLIC OPTIMAL CONTROL PROBLEMS

Fangfang DU, Tongjun SUN   

  1. School of Mathematics, Shandong University, Jinan 250100, China
  • 收稿日期:2023-06-23 修回日期:2024-07-19 发布日期:2024-12-06
  • 通讯作者: † Tongjun SUN, E-mail:tjsun@sdu.edu.cn
  • 作者简介:Fangfang DU, E-mail:202111897@mail.sdu.edu.cn
  • 基金资助:
    National Natural Science Foundation of China (11871312, 12131014) and the Natural Science Foundation of Shandong Province, China (ZR2023MA086).

A BICUBIC B-SPLINE FINITE ELEMENT METHOD FOR FOURTH-ORDER SEMILINEAR PARABOLIC OPTIMAL CONTROL PROBLEMS

Fangfang DU, Tongjun SUN   

  1. School of Mathematics, Shandong University, Jinan 250100, China
  • Received:2023-06-23 Revised:2024-07-19 Published:2024-12-06
  • Contact: † Tongjun SUN, E-mail:tjsun@sdu.edu.cn
  • About author:Fangfang DU, E-mail:202111897@mail.sdu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (11871312, 12131014) and the Natural Science Foundation of Shandong Province, China (ZR2023MA086).

摘要: A bicubic B-spline finite element method is proposed to solve optimal control problems governed by fourth-order semilinear parabolic partial differential equations. Its key feature is the selection of bicubic B-splines as trial functions to approximate the state and co-state variables in two space dimensions. A Crank-Nicolson difference scheme is constructed for time discretization. The resulting numerical solutions belong to $C^2$ in space, and the order of the coefficient matrix is low. Moreover, the Bogner-Fox-Schmit element is considered for comparison. Two numerical experiments demonstrate the feasibility and effectiveness of the proposed method.

关键词: bicubic B-spline finite element method, optimal control problem, Bogner-Fox-Schmit element, Crank-Nicolson scheme, numerical experiment

Abstract: A bicubic B-spline finite element method is proposed to solve optimal control problems governed by fourth-order semilinear parabolic partial differential equations. Its key feature is the selection of bicubic B-splines as trial functions to approximate the state and co-state variables in two space dimensions. A Crank-Nicolson difference scheme is constructed for time discretization. The resulting numerical solutions belong to $C^2$ in space, and the order of the coefficient matrix is low. Moreover, the Bogner-Fox-Schmit element is considered for comparison. Two numerical experiments demonstrate the feasibility and effectiveness of the proposed method.

Key words: bicubic B-spline finite element method, optimal control problem, Bogner-Fox-Schmit element, Crank-Nicolson scheme, numerical experiment

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