Simulation interruptions

General
1

Dear NSEM community,

I would like to ask for your advice regarding some irregularities I encountered in my simulations.

The setup: I am running NSEM simulations on a shared Windows machine (one PC, multiple user accounts). At the same time, colleagues often run CST simulations on the same machine. Unfortunately, I was not able to run my simulations in a situation where I was the only user.

The issue:

  • Normally, filling the impedance matrix takes about 290s.

  • In my case, the filling process stopped at some point until I pressed Return in the console. Afterwards, the simulation continued with the next frequency point.

  • A second, longer interruption happened overnight, visible only the next morning, so the amount of time is higher.

  • These interruptions occurred across different simulations with the same data/framework.

My questions:

  1. Could running CST in parallel interfere with NSEM (e.g., by setting registers also used by NSEM)?

  2. Could the issue be related to the machine itself, or still a user-side problem (CAD, Python code, etc.)?

  3. What about the results: are the data from the interrupted runs (e.g., 9th and 13th iteration) defective, or are they still valid except for the interrupted points? Should I always restart the full run in such cases?

Screenshots of the interruptions are following for reference.

Thank you very much for your help and insights.

Best regards
Michael

9th iteration
9th iteration1920Ă—1021 193 KB

13th iteration
13th iteration1920Ă—1021 188 KB

marginal information

Simulation:
1 to 2 GHz
28 Frequency steps
dence solver
quad9
7102 number of unknown
Both objects in one block
goal: simulate the scattered reflection of the second object as S11 (over distance after post processing)

python code

If heare are syntaxerrors than only becouse of deleting not necessary parts to make it more readable. In general it works. For hints, I’m still open.

pythoncode.txt (913 Bytes)

Sim Log file .OUT

SIM_LOG.txt (48.9 KB)

JOU

Used_JOU.txt (2.8 KB)

be aware of the includet path for material, and cad files.

Sciebo/Nextcloud link to antenna CAD.sat-file
Antenna_CAD
2

Hi Michael,

Simultaneous usage of NSEM and CST on the same machine will definitely impact the runtime of both software packages. It is highly recommended to adopt some time-sharing coordination if possible so that all users get the best experience.

The interruptions should not affect the quality of the data, so you are free to use those results.

Regarding the one time you had to hit enter, I have observed before that in the Windows cmd terminal a user can inadvertently hit certain keystrokes that pause operation of the terminal. Specifically, for example, if the terminal is set to Quick Edit mode, then clicking in the terminal will pause operation. Thus, this case may have been an inadvertent mouse click or keystroke that paused operation. If you want to turn this off, right-click the terminal’s title bar, select “Properties,” and uncheck “Quick Edit Mode.” You can still manually enter selection mode by pressing Ctrl+M.

Let me know if this doesn’t help.

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3

Thanks, I guess that was the problem, unwanted entries that led to the break of the simulation.

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