On Mon, 14 May 2007, A A wrote: > I faced a rather strange beaviour of my system. I make a 3d simulation > of a gaussian wave propagating through silver block with a periodical > holes and measure a transmission spectrum (ctl is included). I observe > following: I fix source and block with holes (thus the distance between > them is always constant), I also fix the distance between block and flux > object which gather spectrum data. After it I change the number of cells > in Z-direction (the direction of wave propagation), one can predict that > there will be the same results however it is not so. If I increase my > cell by 1 one result is obtained and if by two another one. They have > rather similar form but different amplitude and one is shifted in > caomparison with another. I tried to make a bandwith of the source > narrower and decrease Courant value but it did not work. I wonder what > can be wrong here. Thanks in advance. Andrew Komvzvoda.
Possibly you are running for too short a time, and the pulse hasn't completely passed through the system in one (or both) of the simulations. I notice that you are running for a fixed total time rather than using stop-when-fields-decayed at the flux plane. Also note that if your source is too close to your structure that may change the results (because the local density of states near the structure is different, and hence the same current source will emit a different power). Cordially, Steven G. Johnson _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
