Search found 172 matches

by Hale_812
Mon 02 Mar 2020, 05:59
Forum: Usage
Topic: What is the relation of amplitude returned by harminv() to abs(fft(voltage)) ?
Replies: 3
Views: 3886

Re: What is the relation of amplitude returned by harminv() to abs(fft(voltage)) ?

As I mentioned it, yes. And I did not find anything useful there; it just calls the binary program, and I don't know what's inside.

Harminv does not have any user-oriented documentation, except a basic explanation that it is cooler than FFT. Actually, I could not find technical documentation either.
by Hale_812
Thu 20 Feb 2020, 02:28
Forum: Usage
Topic: Potential Speed Issues
Replies: 3
Views: 2878

Re: Potential Speed Issues

I use it in Windows... But I would try these solver parameters first: --engine=multithreaded %engine using compressed operator + sse vector extensions + MPI + multithreading --numThreads=<n> %Force use n threads for multithreaded engine --dump-statistics %dump simulation statistics to 'openEMS_run_s...
by Hale_812
Thu 20 Feb 2020, 02:21
Forum: Usage
Topic: RCS calculation in very high frequencies
Replies: 4
Views: 5180

Re: RCS calculation in very high frequencies

I did not see your example yet... just for comparison, I was simulating pulse scattering (not RCS, we were interested in energy leak paths) from large objects in a space like 3x5x2 meters at 10-20 GHz band. It was fitting in 32 Gb with proper optimization of mesh; but I was cutting on resolution in ...
by Hale_812
Wed 19 Feb 2020, 02:53
Forum: Usage
Topic: [solved] Radial stub convergence confusion
Replies: 5
Views: 4521

Re: [solved] Radial stub convergence confusion

If you really want details, try googling for radiating boundary conditions. The simpler paper on MUR: https://people.engineering.olemiss.edu/~yakovlev/Yakovlev_Publications/Yakovlev_paper_27.pdf The harder paper on all the methods: https://www.e-fermat.org/files/articles/154db8c5adee49.pdf But if yo...
by Hale_812
Tue 18 Feb 2020, 06:54
Forum: Usage
Topic: [solved] Radial stub convergence confusion
Replies: 5
Views: 4521

Re: Radial stub convergence confusion

I did not get the reason yet, but I see a flaw in your model: MUR conditions should be placed far away from the model, especially from leaking sides. (Y direction). MUR is a condition for normal far field ONLY. Oblique or evanescent wave hitting MUR will cause problems. Try at least quarterwave, or ...
by Hale_812
Mon 10 Feb 2020, 07:55
Forum: Usage
Topic: What is the relation of amplitude returned by harminv() to abs(fft(voltage)) ?
Replies: 3
Views: 3886

What is the relation of amplitude returned by harminv() to abs(fft(voltage)) ?

It appears, harminv is binary compiled, which makes sense when talking about performance.
But I could not get a relation of harminv amplitudes to corresponding components of FFT from voltage.
How can I bring one o another in order to pinpoint the resonant peaks on the spectrum?
by Hale_812
Mon 10 Feb 2020, 05:04
Forum: Feedback
Topic: bug in InitFDTD 'MaxTime'
Replies: 5
Views: 4000

Re: bug in InitFDTD 'MaxTime'

1000000000 it is crazy large. looks like a precision problem when timesteps are very small. timestep is 4.28692e-013 stoptime is 1e-7 there should be only 233267 timesteps, but I already got 789965 steps today. is something wrong here? stoptime=1e-7; FDTD = InitFDTD('CoordSystem', 0, 'MaxTime', stop...
by Hale_812
Mon 10 Feb 2020, 01:43
Forum: Development
Topic: Time data in vtk dumps
Replies: 2
Views: 3338

Re: Time data in vtk dumps

I mean, I can extract, but it is very hard feeding the time data to paraview. If it is inside, it is accepted automatically for every "frame" as exact time.
by Hale_812
Fri 07 Feb 2020, 08:39
Forum: Feedback
Topic: bug in InitFDTD 'MaxTime'
Replies: 5
Views: 4000

Re: bug in InitFDTD 'MaxTime'

No, Thorsten, it does not work. Not always. And I don't know why. I set the stoptime at 1e-7 and see how it runs beyond 1.5e-7. Sometimes it stops, sometimes not. WHy do I do this? I excite a resonator with feeding strips and lumped port, a port load is at the other side. It is inside MUR box. T\Whe...