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Volume 21, Issue 3
A Difference Finite Element Method for Convection-Diffusion Equations in Cylindrical Domains

Chenhong Shi, Yinnian He, Dongwoo Sheen & Xinlong Feng

Int. J. Numer. Anal. Mod., 21 (2024), pp. 407-430.

Published online: 2024-05

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  • Abstract

In this paper, we consider 3D steady convection-diffusion equations in cylindrical domains. Instead of applying the finite difference methods (FDM) or the finite element methods (FEM), we propose a difference finite element method (DFEM) that can maximize good applicability and efficiency of both FDM and FEM. The essence of this method lies in employing the centered difference discretization in the $z$-direction and the finite element discretization based on the $P_1$ conforming elements in the $(x, y)$ plane. This allows us to solve partial differential equations on complex cylindrical domains at lower computational costs compared to applying the 3D finite element method. We derive stability estimates for the difference finite element solution and establish the explicit dependence of $H_1$ error bounds on the diffusivity, convection field modulus, and mesh size. Finally, we provide numerical examples to verify the theoretical predictions and showcase the accuracy of the considered method.

  • AMS Subject Headings

65N06, 65N12, 65N30

  • Copyright

COPYRIGHT: © Global Science Press

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@Article{IJNAM-21-407, author = {Shi , ChenhongHe , YinnianSheen , Dongwoo and Feng , Xinlong}, title = {A Difference Finite Element Method for Convection-Diffusion Equations in Cylindrical Domains}, journal = {International Journal of Numerical Analysis and Modeling}, year = {2024}, volume = {21}, number = {3}, pages = {407--430}, abstract = {

In this paper, we consider 3D steady convection-diffusion equations in cylindrical domains. Instead of applying the finite difference methods (FDM) or the finite element methods (FEM), we propose a difference finite element method (DFEM) that can maximize good applicability and efficiency of both FDM and FEM. The essence of this method lies in employing the centered difference discretization in the $z$-direction and the finite element discretization based on the $P_1$ conforming elements in the $(x, y)$ plane. This allows us to solve partial differential equations on complex cylindrical domains at lower computational costs compared to applying the 3D finite element method. We derive stability estimates for the difference finite element solution and establish the explicit dependence of $H_1$ error bounds on the diffusivity, convection field modulus, and mesh size. Finally, we provide numerical examples to verify the theoretical predictions and showcase the accuracy of the considered method.

}, issn = {2617-8710}, doi = {https://doi.org/10.4208/ijnam2024-1016}, url = {http://global-sci.org/intro/article_detail/ijnam/23129.html} }
TY - JOUR T1 - A Difference Finite Element Method for Convection-Diffusion Equations in Cylindrical Domains AU - Shi , Chenhong AU - He , Yinnian AU - Sheen , Dongwoo AU - Feng , Xinlong JO - International Journal of Numerical Analysis and Modeling VL - 3 SP - 407 EP - 430 PY - 2024 DA - 2024/05 SN - 21 DO - http://doi.org/10.4208/ijnam2024-1016 UR - https://global-sci.org/intro/article_detail/ijnam/23129.html KW - Convection-diffusion equation, difference finite element method, cylindrical domain, error estimates. AB -

In this paper, we consider 3D steady convection-diffusion equations in cylindrical domains. Instead of applying the finite difference methods (FDM) or the finite element methods (FEM), we propose a difference finite element method (DFEM) that can maximize good applicability and efficiency of both FDM and FEM. The essence of this method lies in employing the centered difference discretization in the $z$-direction and the finite element discretization based on the $P_1$ conforming elements in the $(x, y)$ plane. This allows us to solve partial differential equations on complex cylindrical domains at lower computational costs compared to applying the 3D finite element method. We derive stability estimates for the difference finite element solution and establish the explicit dependence of $H_1$ error bounds on the diffusivity, convection field modulus, and mesh size. Finally, we provide numerical examples to verify the theoretical predictions and showcase the accuracy of the considered method.

Chenhong Shi, Yinnian He, Dongwoo Sheen & Xinlong Feng. (2024). A Difference Finite Element Method for Convection-Diffusion Equations in Cylindrical Domains. International Journal of Numerical Analysis and Modeling. 21 (3). 407-430. doi:10.4208/ijnam2024-1016
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