Method of fundamental solutions for the problem of doubly-periodic potential flow

In this paper, we propose a method of fundamental solutions for the problem of two-dimensional potential flow in a doubly-periodic domain. The solution involves a doubly-periodic function, to which it is difficult to give an approximation by the conventional method of fundamental solutions. We propose to approximate it by a linear combination of the periodic fundamental solutions, that is, complex logarithmic potential with sources in a doubly-periodic array constructed using the theta functions. Numerical examples show the effectiveness of our method.