Search found 1402 matches

by thorsten
Sun 20 Sep 2020, 10:39
Forum: Usage
Topic: material density
Replies: 2
Views: 29

Re: material density

This property does not affect the EM simulation at all.
It is only required for SAR post-processing.
The unit is of course kg/m³. E.g. ~1000 for water.

regards
Thorsten
by thorsten
Fri 18 Sep 2020, 17:36
Forum: Usage
Topic: No output when running simulation
Replies: 6
Views: 1836

Re: No output when running simulation

Thanks for verifying. I will make a patch and a new version soon...
by thorsten
Sun 13 Sep 2020, 20:32
Forum: Usage
Topic: function that restores structures from the xml-file
Replies: 1
Views: 167

Re: function that restores structures from the xml-file

Hi, the python interface can do this. It has a read functionality too. But , I have never needed this since I usually only ever added a post_proc_only flag and just reran the entrie matlab/octave script just without deleting any data and without running the solver. This would only do the post-proces...
by thorsten
Sun 13 Sep 2020, 20:14
Forum: Usage
Topic: No output when running simulation
Replies: 6
Views: 1836

Re: No output when running simulation

I think this is how it should be in "matlab/private/invole_openEMS.m" Lines 47-end:

Code: Select all

exitcode = system(command);
if (exitcode~=0);
    error(['openEMS binary exited with error-code ' num2str(exitcode)]);
end
This works for me, can you verify...
by thorsten
Sun 13 Sep 2020, 20:09
Forum: Usage
Topic: No output when running simulation
Replies: 6
Views: 1836

Re: No output when running simulation

The cause is this change:
https://github.com/thliebig/openEMS/com ... 6b9a7d17fc

I think we have to revert it...
Thanks for the feedback.
regards
Thorsten
by thorsten
Sun 13 Sep 2020, 19:54
Forum: Usage
Topic: High level FDTD question
Replies: 2
Views: 86

Re: High level FDTD question

Hi Dom, I'm sure I have answered this before but I cannot find it ;) The displayed energy is only a rough/ fast estimate. It for example completely neglects the material distribution (aka assumes everything to be vacuum or metal). During the excitation the energy in-flow is not constant and some dec...
by thorsten
Tue 01 Sep 2020, 21:45
Forum: Usage
Topic: imaginary part of feed.R
Replies: 1
Views: 258

Re: imaginary part of feed.R

Hi, the FDTD method is a time domain method (TD). Thus it does not have any concept of complex numbers or values. Only after you convert data from time domain into frequency domain (via FFT or DFT) during post-processing you have complex values. Thus you cannot use complex values for anything or any...
by thorsten
Tue 01 Sep 2020, 21:42
Forum: Usage
Topic: Time step (or sampling frequency) of the field dumps
Replies: 1
Views: 156

Re: Time step (or sampling frequency) of the field dumps

I assume you mean the hdf5 field dumps? The openEMS read functions contain a TD signal with the exact timesteps that were saved. This is of course very important if you want to transform from TD to FD. Have a close look here: https://github.com/thliebig/openEMS/blob/master/matlab/ReadHDF5FieldData.m...
by thorsten
Tue 01 Sep 2020, 21:38
Forum: Usage
Topic: simulation never finishes. fields seem frozen?
Replies: 2
Views: 233

Re: simulation never finishes. fields seem frozen?

Energy that continuously increases usually means that the PML have gone unstable. The PML are usually the only element that is not inherently stable.
You may try to move them further away and/or make sure the mesh inside of them is homogeneous and in good shape.
by thorsten
Sun 26 Jul 2020, 14:59
Forum: Install
Topic: TinyXML becomes a big problem
Replies: 12
Views: 4386

Re: TinyXML becomes a big problem

Well yeah, Octave from snap won't work I guess.

I have updated the readme on github, let me know if this are really all required packages...

regards
Thorsten