Unconditional positivity-preserving and energy stable schemes for a reduced poisson-nernst-planck system
The Poisson-Nernst-Planck (PNP) system is a widely accepted model for simulation of ionic channels. In this paper, we design, analyze, and numerically validate a second order unconditional positivity-preserving scheme for solving a reduced PNP system, which can well approximate the three dimensional ion channel problem. Positivity of numerical solutions is proven to hold true independent of the size of time steps and the choice of the Poisson solver. The scheme is easy to implement without resorting to any iteration method. Several numerical examples further confirm the positivity-preserving property, and demonstrate the accuracy, efficiency, and robustness of the proposed scheme, as well as the fast approach to steady states.
H. Liu and W. Maimaitiyiming, "Unconditional positivity-preserving and energy stable schemes for a reduced poisson-nernst-planck system," Communications in Computational Physics, vol. 27, no. 5, pp. 1505 - 1529, Global Science Press, May 2020.
The definitive version is available at https://doi.org/10.4208/CICP.OA-2019-0063
Mathematics and Statistics
Keywords and Phrases
Biological channels; Diffusion models; Ion transport; Positivity
International Standard Serial Number (ISSN)
Article - Journal
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01 May 2020