Non-singular Green's functions for the unbounded Poisson equation in one, two and three dimensions
Abstract
This paper is a revised version of the original paper of same title--published in Applied Mathematics Letters 89--containing some corrections and clarifications to the original text. We derive non-singular Green's functions for the unbounded Poisson equation in one, two and three dimensions, using a cut-off function in the Fourier domain to impose a smallest length scale when deriving the Green's function. The resulting non-singular Green's functions are relevant to applications which are restricted to a minimum resolved length scale (e.g. a mesh size h) and thus cannot handle the singular Green's function of the continuous Poisson equation. We furthermore derive the gradient vector of the non-singular Green's function, as this is useful in applications where the Poisson equation represents potential functions of a vector field.
Keywords
Cite
@article{arxiv.1704.00704,
title = {Non-singular Green's functions for the unbounded Poisson equation in one, two and three dimensions},
author = {Mads Mølholm Hejlesen and Grégoire Winckelmans and Jens Honoré Walther},
journal= {arXiv preprint arXiv:1704.00704},
year = {2020}
}