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

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Ranjan K.R.; Gowrisankar S.

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF NUMERICAL ANALYSIS AND OPTIMIZATION Year:2024 | Volume:14 | Issue:2 Page(s): 347-366

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Title

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

Author(s)

Ranjan K.R. | Gowrisankar S. | Issue Writer Certificate

Keywords

Convection-diffusion problem

The NIPG methods

Shishkin mesh

Interior layers

Uniform convergence

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.

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