Photonic simulations are notorious for being computationally expensive and sensitive to boundary conditions. On the forum, you can find solutions to common "Simulation Diverged" errors or advice on setting up perfectly matched layers (PML) to avoid unphysical reflections. 2. Scripting Support
In June 2021, Ansys moved the community support from the original KX platform to the Ansys Learning Forum (ALF) The Struggle: lumerical forum
RE: FDTD propagation error...