Transparent grid termination (TGT): theoretical and computational enhancements

The transparent grid termination (TGT) enables computationally efficient finite difference (FD) numeric solutions of Poisson´s equation for open boundary problems. The paper describes recent theoretical and computational enhancements that extend and enrich the use of TGT methods. Non-Dirichlet boundary conditions can be accepted to simulate conditions other than open boundaries, such as uniform fields. The use of the symmetry of the buffer region is included to reduce the computational time for the TGT coefficients.