FDM/FEM for nonlinear convection-diffusion-reaction equations with Neumann boundary conditions—Convergence analysis for smooth and nonsmooth solutions
Journal of Computational and Applied Mathematics(2024)
摘要
This paper aims to present in a systematic form the stability and convergence analysis of a numerical method defined in nonuniform grids for nonlinear elliptic and parabolic convection-diffusion-reaction equations with Neumann boundary conditions. The method proposed can be seen simultaneously as a finite difference scheme and as a fully discrete piecewise linear finite element method. We establish second convergence order with respect to a discrete H1-norm which shows that the method is simultaneously supraconvergent and superconvergent. Numerical results to illustrate the theoretical results are included.
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关键词
Finite difference method,Finite element method,Nonuniform grid,Error analysis,Nonlinear convection-diffusion-reaction,Homogeneous Neumann boundary conditions
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