On Tue, 29 Aug 2006, hb wrote:
I calculate the flux of a bunch of random sources(contious-src
sources) in Z direction. Before "meep-fields-flux-in-box fields ...", I
use a run function as follow:
(run-until 200
(at-beginning output-epsilon))
However when I changed 200 into other number(such as 300. 1000. 2000),
the results of the flux are different with each other greatly. Is there
some thing wrong?
What does it mean, if I use 200 or 300?
If you use complex fields (set! force-complex-fields? true), then the flux
(Re E* x H) is the time-average flux for steady-state fields with a
single frequency. Thus, if you use complex fields and use only
continuous-src sources with a single frequency, then the flux-in-box
should *eventually* settle down to a constant value, if you wait long
enough for transient effects to die away (assuming you have absorbing
boundaries).
If you don't use complex fields, then the flux from flux-in-box is just
the instantaneous flux at a given time, and will oscillate. In this case,
it's not surprising if you get different values from different times.
Steven
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