RCS with changing theta

How to use openEMS. Discussion on examples, tutorials etc

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gump
Posts: 1
Joined: Thu 14 May 2020, 21:28

RCS with changing theta

Post by gump » Thu 14 May 2020, 21:45

Hi everyone,

I'm trying to find the RCS of a cylinder in a way similar to the sphere example but with a changing theta instead of frequency. I've gotten the code to work (I think) but it takes a very long time to run. I was wondering if there's something I could do to speed things up or if I'm doing something stupid that's slowing things down.
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thorsten
Posts: 1402
Joined: Mon 27 Jun 2011, 12:26

Re: RCS with changing theta

Post by thorsten » Sat 23 May 2020, 12:14

Well the mesh usually is the main cause of long simulations.
A good indication is if the excitation is already requiring a large amount of time-steps and the nyquist rate is very high too.
Example for good numbers:

Code: Select all

FDTD timestep is: 9.63258e-13 s; Nyquist rate: 173 timesteps @3.00041e+09 Hz
Excitation signal length is: 2975 timesteps (2.86569e-09s)
Using a lambda/40 mesh is of course quite dense. I would look if you can get away with something coarser for your initial trials and only do a dense mesh in a final run and only if you think you really need it.

regards
Thorsten

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