Transverse Electric Propagation of a Two-Dimensional Wave Traveling in a Gas Turbine Engine

Two-dimensional transverse electric TE electromagnetic scattering of a sine source disturbance was numerically solved using the finite difference-time domain FD-TD method with the inclusion of the Mur absorbing boundary conditions. The imposition of the appropriate boundary conditions appears to be effective for absorption of dispersive, multimodal, and even evanescent energy. The absorption as used in this study is thought at best to be in order of the analytical absorbing boundary condition because of increasing reflection at oblique incident angles. The solution presented demonstrates the efficient use of the second approximation of the Mur boundary condition since the mesh was simple, incorporation of the TE equations quite straightforward, and application of the boundary stipulations continuously dependent upon the data. This method development and subsequent solution does show that a radiative point source in a two-dimensional mesh can simulate an electromagnetic disturbance occurring from a region in a gas turbine engine, along with its attendant wave distribution and pattern with intensity magnitudes that help demonstrate bow an excitation can possibly affect an electromagnetic device in its operational voltage surges.