Re: [Meep-discuss] numerical instability in vacuum - no materials, no pml

Hi, whenever you set the phase in either the Y- or Z- symmetry to -1, the simulation eventually becomes unstable. I have tested out all four combinations for you, and I can tell that only (set! symmetries (list (make mirror-sym (direction Y) (phase 1)) (make mirror-sym (direction Z) (phase 1)))

[Meep-discuss] numerical instability in vacuum - no materials, no pml

Hi all, I'm getting a numerical instability in meep with just a wave traveling through a vacuum--no materials, no pml. Has anyone seen that before? So far all I know is that the effect depends on the cell size (subwavelength) and on the resolution and symmetries. Here is an example: The fields star