Discontinuous Galerkin approach for two-parametric convection-diffusion equation with discontinuous source term

Document Type : Research Article

Authors

• K. R. Ranjan
• S. Gowrisankar

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

10.22067/ijnao.2024.84456.1316

Abstract

In this article, we explore the discontinuous Galerkin finite element method for two-parametric singularly perturbed convection-diffusion problems with a discontinuous source term. Due to the discontinuity in the source term, the problem typically shows a weak interior layer. Also, the presence of multiple perturbation parameters in the problem causes boundary layers on both sides of the boundary. In this work, we develop the nonsymmetric discontinuous Galerkin finite element method with interior penalties to handle the layer phenomenon. With the use of a typical Shishkin mesh, the domain is discretized, and a uniform error estimate is obtained. Numerical experiments are conducted to validate the theoretical conclusions.

Keywords

• Convection-diffusion problem
• The NIPG methods
• Shishkin mesh
• Interior layers
• Uniform convergence

Main Subjects

• Numerical Analysis

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