Optimal Error Estimates of Two Mixed Finite Element Methods for Parabolic Integro-Differential Equations with Nonsmooth Initial Data |
| |
Authors: | Deepjyoti Goswami Amiya K Pani Sangita Yadav |
| |
Affiliation: | 1. Departamento de Matemática, UFPR, Centro Politécnico, Jardim das Américas, Caixa Postal 19081, CEP: 81531-980, ?Curitiba, Paran, Brazil 2. Department of Mathematics, Industrial Mathematics Group, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India 3. Department of Mathematics, Birla Institute of Technology and Science, Pilani Pilani, ?333031, Rajasthan, India
|
| |
Abstract: | In the first part of this article, a new mixed method is proposed and analyzed for parabolic integro-differential equations (PIDE) with nonsmooth initial data. Compared to the standard mixed method for PIDE, the present method does not bank on a reformulation using a resolvent operator. Based on energy arguments combined with a repeated use of an integral operator and without using parabolic type duality technique, optimal $L^2$ L 2 -error estimates are derived for semidiscrete approximations, when the initial condition is in $L^2$ L 2 . Due to the presence of the integral term, it is, further, observed that a negative norm estimate plays a crucial role in our error analysis. Moreover, the proposed analysis follows the spirit of the proof techniques used in deriving optimal error estimates for finite element approximations to PIDE with smooth data and therefore, it unifies both the theories, i.e., one for smooth data and other for nonsmooth data. Finally, we extend the proposed analysis to the standard mixed method for PIDE with rough initial data and provide an optimal error estimate in $L^2,$ L 2 , which improves upon the results available in the literature. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|