Numerical conformal mapping of periodic structure domains

We propose a method of numerical conformal mapping of periodic structure domains onto periodic parallel slit domains. In the method presented here, the mapping problem is reduced to a Dirichlet one for a pair of conjugate harmonic functions with a periodic boundary condition. We modify the charge simulation method for solving periodic boundary value problem and apply it to our mapping problem. Some numerical examples show that our method is efficient. We also show an application of our method to the analysis of potential flow past obstacles in a periodic array.