Hi, thanks for the offer, but we already use COMSOL for that purpose, we would like to use FDTD for comparison, to see which method fits best for our problem.
tobias On Mon, 2010-10-04 at 10:55 +0200, Sven Burger wrote: > Hi Tobias, > > did you also consider using a time-domain solver for directly computing > the resonances of the structure? Here you can find a preprint where we > have looked at a different cavity problem. : > http://arxiv.org/abs/1003.2314 > In our FEM solver, Bloch-periodic boundary conditions for your case of > discrete rotational symmetry are not yet implemented (but on the list > for future development). However, FEM often allows to tackle relatively > large setups very accurately, therefore it might be possible to simulate > the full resonator. If you are interested, please let me know the > dimensions of the problem, and I can estimate the computational effort > for solving the FEM problem. > > Regards, Sven > > Dr. Sven Burger > Zuse Institute Berlin & JCMwave GmbH > Takustrasse 7 (ZIB) > 14195 Berlin > Germany > > Tel. +49 30 841 85 302 > > tobias wrote: > > Hi, > > > > the meep wiki tells me that only continuous rotational symmetry can be > > simulated using cylindrical coordinates. Since my model should be a grated > > ring segment, which means it has a 'slit' in the radial direction on top, > > that is repeated throughout the ring, I would need discrete rotational > > symmetry. > > I also tried to use a 2 dimensional simulation domain in cylindrical > > coordinates by setting: > > > > (set! geometry-lattice (make lattice (size 10 10 no-size))) > > > > but the domain seems to be forced to 1D, at least in the r,phi plane. > > > > tobias > > -----Original Message----- > > From: "Breeze, Jon D B" <[email protected]> > > To: "[email protected]" <[email protected]>, > > "[email protected]" <[email protected]> > > Date: Fri, 1 Oct 2010 21:39:50 +0100 > > Subject: Re: [Meep-discuss] Periodic boundary condition > > > > Dear Tobias, > > > > Your best bet would be to use cylindrical coordinates. Then you could find > > the eigenmodes for a given azimuthal mode index. See the tutorial examples. > > > > Jon Breeze > > > > > > tobias <[email protected]> wrote: > > > > > > Hi, > > > > I am trying to find eigenmodes of a grated ring resonator. To do so I want > > to simulate one segment of the ring and apply periodic boundary conditions. > > I would like to know if there is another way to produce periodicity then > > mirror symmetry, since my boundaries are not parallel and therefore I cant > > use that. > > > > best regards > > Tobias > > > > > > _______________________________________________ > > meep-discuss mailing list > > [email protected] > > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss > > > > Date: Fri, 1 Oct 2010 21:39:50 +0100 > > Subject: Re: [Meep-discuss] Periodic boundary condition > > > > > > > > _______________________________________________ > > meep-discuss mailing list > > [email protected] > > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss > > _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
