A new unconditionally stable explicit scheme for the convection-diffusion equation with Robin boundary conditions

作者：Xie Zhihua; Lin Jianguo^*; Zhou Juntao

来源：International Journal of Computer Mathematics, 2008, 85(12): 1833-1847.

DOI：10.1080/00207160701581574

• convection-diffusion equation
• local series expansion method
• unconditionally stable
• alternating direction explicit scheme

An alternating direction explicit (ADE) scheme to solve the unsteady convection-diffusion equation with Robin boundary conditions is presented and discussed in this paper. It was derived based on the local series expansion method and proved unconditionally stable by von Neumann stability analysis. Thereafter, the ADE scheme is compared with the conventional schemes, and a comparison between the amplification factor of all schemes and the exact one shows that the proposed scheme can simulate well both convection- and diffusion-dominated problems. Finally, the proposed method was validated by a numerical experiment which indicates that, for large cell Reynolds numbers, the proposed scheme, which has unconditional stability, is more accurate than implicit schemes and most explicit schemes. It is also shown that the proposed scheme is simple to implement, economical to use, effective for dealing with Robin boundary conditions and easy to apply to multidimensional problems.

• 出版日期2008
• 单位大连海事大学