Supercloseness of the HDG method on Shishkin mesh for a singularly perturbed convection diffusion problem in 2D
<|reference_start|>Supercloseness of the HDG method on Shishkin mesh for a singularly perturbed convection diffusion problem in 2D: This paper presents the first analysis of parameter-uniform convergence for a hybridizable discontinuous Galerkin (HDG) method applied to a singularly perturbed convection-diffusion problem in 2D using a Shishkin mesh. The primary difficulty lies in accurately estimating the convection term in the layer, where existing methods often fall short. To address this, a novel error control technique is employed, along with reasonable assumptions regarding the stabilization function. The results show that, with polynomial degrees not exceeding $k$, the method achieves supercloseness of almost $k+\frac{1}{2}$ order in an energy norm. Numerical experiments confirm the theoretical accuracy and efficiency of the proposed method.<|reference_end|>
@article{ma2024supercloseness,
    title={Supercloseness of the HDG method on Shishkin mesh for a singularly
  perturbed convection diffusion problem in 2D},
    author={Xiaoqi Ma, Jin Zhang},
    journal={arXiv preprint arXiv:2406.18948},
    year={2024},
    archivePrefix={arXiv},
    eprint={2406.18948},
    primaryClass={math.NA cs.NA}
}