Efficient numerical schemes on modified graded mesh for singularly perturbed parabolic convection-diffusion problems

Iranian Journal of Numerical Analysis and Optimization

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 23 مرداد 1404

نوع مقاله: Research Article

شناسه دیجیتال (DOI): 10.22067/ijnao.2025.93523.1646

نویسنده

Kishun Kumar Sah^*

Department of Mathematics, National Institute of Technology Patna, India.

چکیده

In this study, numerical approaches to the singularly perturbed problems of convection diffusion type are presented. The backward Euler method is applied to a uniform mesh in the temporal domain, while in the spatial domain, we utilize both the hybrid midpoint finite difference scheme and the high order via differential identity expansion (HODIE) scheme on a modified graded mesh. The solution to the problem introduces a boundary layer on the right side of the domain. Both of the above methods are proved to have identical convergence with respect to the perturbation parameter. We have also provided numerical results in order to verify the theoretical conclusions. We have demonstrated that the applied approaches provide uniform convergence of first order in the temporal variable and second order up to a logarithmic factor with respect to spatial variable.

کلیدواژه‌ها

Perturbation problems؛ Uniform convergence؛ Boundary layers؛ Hybrid midpoint finite difference scheme؛ HODIE finite difference scheme