tran quyet thang writes:
>
>
> Dear professor Johnson and Meep users,
>
> It has been mentioned multiple times that a capacity similar to variable
mesh size can be emulated in meep by applying the coordinate transformation
technique formulated in "Coordinate Transformation &
> Invariance in El
Dear professor Johnson and Meep users,
It has been mentioned multiple times that a capacity similar to variable mesh
size can be emulated in meep by applying the coordinate transformation
technique formulated in "Coordinate Transformation &
Invariance in Electromagnetism".
However my attempts i
Hi, Yang, thanks for your help. I had previously tried the case of turning
off eps-averaging, and found it can only weaken but not completely avoid
the divergence if the run-time is more longer. The following is a new
example in which the run-time is 6553.6. When the eps-averaging is turned
off, i
I also met this problem before.
If your structure is so large and calculation time is too long, you should
activate non-averaging to avoid divergence issue just like;
(set! eps-averaging? false)
Quoting dy zhao <[EMAIL PROTECTED]>:
> Dear Dr. Steven and meep users,
>
> Recently, I have met the
Dear Dr. Steven and meep users,
Recently, I have met the divergence problem several times. Here is just one
example. In order to get the more accurate transmission of a PC slab, I set
a relatively long run-time, but the field is divergent at about 800
meep-time-step for r=0.25. When r=0.20, it is
On Jul 31, 2008, at 3:28 AM, Jefferson Thomas wrote:
> Thanks. One more thing about adding the sources in case of
> symmetries :
> If I have a box of sizes 4, 4, 4 with odd symmetry on X and I want
> to add
> a source with Ex with
> f.add_point_source(Ex, src, vec(1, 1, 1), 10); where 10
Thanks. One more thing about adding the sources in case of symmetries :
If I have a box of sizes 4, 4, 4 with odd symmetry on X and I want to add
a source with Ex with
f.add_point_source(Ex, src, vec(1, 1, 1), 10); where 10 means
the amplitude
then as far as I understand I have to add a symm
You are right. When I symmetrized the eps function the divergences disappeared.
I really didnt know that this one last pixel could have such a big influence.
I have also some other kind of divergences in other cases. They seem
not to be connected
to symmetries but arise from PML layers. I am start
On Jul 30, 2008, at 9:20 PM, Jefferson Thomas wrote:
> What you are saying is really very helpful. In fact I had no idea I
> have to supply the symmetric
> source. I will try it right now and see how it goes.
See: http://ab-initio.mit.edu/wiki/index.php/Exploiting_symmetry_in_Meep
If you don't su
Hi Steven,
What you are saying is really very helpful. In fact I had no idea I
have to supply the symmetric
source. I will try it right now and see how it goes.
On the other hand I dont understand the thing with the symmetric eps.
Although I dont know how meep works internally with the symmetries
Your problem seems to stem from the fact that neither your structure
nor your sources obey the symmetry you specified.
On Jul 22, 2008, at 9:40 PM, Jefferson Thomas wrote:
>meep::symmetry S=meep::identity();
>S = S+ meep::mirror(meep::X, v)*(-1); /// Introducing symmetries
> on X and Y a
On Jul 16, 2008, at 10:11 PM, Jefferson Thomas wrote:
> - exciting with one gaussian_src_time with freq 0.7, width 3.0 for the
Try using a narrower-bandwidth source centered on your mode
frequency. That will also help harminv out, in that with a narrower
bandwidth source harminv has cleaner d
Hi
I have a problem with meep. I am creating a pretty big simulation of
photonic crystals.
The size of the volume is about 200x200x200 and it is running on MPI.
There is a photonic crystal structure inside and a nanocavity which
is supposed to have a Q-factor of about 10^7 so to calculate
it I need
Hi Steven and Meep's user,
When i calculate a surface plamson waveguide with metal-air-metal
structure, fields always deverge at the metal-air interface nearby (and
insider) the PML.
The problem also exists in some other FDTD programs. Could you give some
comment and advice?
The following ctl f
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