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Unconditional optimal error estimate of the projection/Lagrange-Galerkin finite element method for the Boussinesq equations

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Abstract

This paper provides an unconditional optimal convergence of a fractional-step method for solving the Boussinesq equations. In this method, the convection is treated by the Lagrange-Galerkin technique, whereas the diffusion and the incompressibility are treated by the projection method. There are lots of authors who worked on this method, and some authors gave the error estimate of this method. But, to our best knowledge, the error estimate for this method is under certain time-step restrictions. In this paper, we prove that the methods are stable almost unconditionally, i.e., when τ and h are smaller than a given constant. The basic idea of our analysis is splitting the error function into three terms, one term between the finite element solution and the projection, the other term between the projection and the time-discrete solution, the third term between the time-discrete solution and the exact solution, and giving the error estimates for each term respectively. Then, we obtain the optimal error estimates in L2 and H1-norm for the velocity and L2-norm for the pressure. In order to show the efficiency of our method, some numerical results are presented.

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Acknowledgements

The authors would like to thank the anonymous referees for their valuable suggestions and comments, which helped to improve the quality of the paper.

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Authors and Affiliations

  1. School of Mathematics and Information Science, Henan Polytechnic University, 454003, Jiaozuo, People’s Republic of China

    Zhiyong Si & Zhang Tong

  2. School of Mathematics and Computational Science, Xiangtan University, Xiangtan, 411105, People’s Republic of China

    Zhiyong Si

  3. School of Information Science and Technology, Zhengzhou Normal University, Zhengzhou, 450044, People’s Republic of China

    Yanfang Lei

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This work was supported by the China Postdoctoral Science Foundation (No. 2018M630907) and Key scientific research projects of Henan colleges and Universities (No. 19B110007).

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Si, Z., Lei, Y. & Tong, Z. Unconditional optimal error estimate of the projection/Lagrange-Galerkin finite element method for the Boussinesq equations. Numer Algor 83, 669–700 (2020). https://doi.org/10.1007/s11075-019-00698-7

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