Abstract
In this work three kinds of decoupled two level finite element methods are proposed and analyzed for the natural convection problem. Firstly, some a priori bounds and the optimal error estimates of velocity and temperature in L 2 norm are provided for the standard Galerkin finite element method. Secondly, by using the coarse grid numerical solutions to decouple the nonlinear coupling term, we establish the convergence results for the proposed decoupled two level finite element schemes with meshes h and H satisfy h=H 2. Finally, two numerical examples are presented to show the efficiency and effectiveness of the proposed algorithms for the steady natural convection problem.
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This work was supported by the NSF of China (No. 11301157, 11371031) and the Natural Science Foundation of Education Department of Henan Province (No.14A110008) and the Doctor Fund of Henan Polytechnic Univeristy (B2012-098) and the NCET-11-1041.
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Zhang, T., Zhao, X. & Huang, P. Decoupled two level finite element methods for the steady natural convection problem. Numer Algor 68, 837–866 (2015). https://doi.org/10.1007/s11075-014-9874-4
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DOI: https://doi.org/10.1007/s11075-014-9874-4