Liebmann - galleries.

DEMO_XY - gallery

Gallery of problems (2D electrostatic fields (X-Y)), which can be solved by DEMO_XY demonstrator.

1. Two parallel plates in vacuum (mesh 200 x 200).
2. Two parallel plates in vacuum (mesh 400 x 400).
3. Plane diode with lateral plates at the cathode potential (mesh 201 x 201).
4. "S" - shaped formed electrode inside grounded casing (mesh 500 x 300).
5. Electrolytic tank with 2 electrodes in grounded casing (mesh 601 x 401).
6. Dual-anode magnetron "with smile" (mesh 401 x 401).
7. Dual-anode magnetron (such as in Paszkowski's book, page 62 or page 51 in English edition) (mesh 401 x 401).
8. Slit diaphragm (such as in Paszkowski's book) (mesh 401 x 401).
9. Two parallel plates in vacuum - inequal length (mesh 200 x 200).
10. Slit diaphragm - "weird version" (mesh 401 x 401).
11. Electrolytic tank with 2 electrodes (inequal diameters of electrodes) (mesh 601 x 401).
12. Electrolytic tank with 2 electrodes (inequal diameters of electrodes, but the same potential) (mesh 601 x 401).
13. Two parallel plates in vacuum (inequal length) (mesh 400 x 400).
14. Electrostatic quadrupole (mesh 401 x 401).
15. Cylindrical capacitor (mesh 401 x 401).
16. Electrostatic quadrupole, defined in radial coordinates (mesh 401 x 401).
17. Electrostatic hexapole, defined in radial coordinates (mesh 401 x 401).
18. Electrostatic "asymmetrical" quadrupole, defined in radial coordinates (mesh 401 x 401).
19. Electrostatic octupole, defined in radial coordinates (mesh 401 x 401).
20. Electrostatic quadrupole with "plate - shaped electrodes" (mesh 401 x 401).
21. Problem 21 - from Physics Stack Exchange, (JohnDow's question) (mesh 170 x 125).
22. Problem 22 - from Physics Stack Exchange, (JohnDow's question) (mesh 210 x 170).
23. Problem from Physics Stack Exchange, (JohnDow's question) (mesh 190 x 280).
24. Problem from Physics Stack Exchange, (JohnDow's question) (mesh 401 x 401).
25. Problem from Physics Stack Exchange, version "with ellipse" (JohnDow's question) (mesh 401 x 401).
26. Problem from Physics Stack Exchange, version "in casing" (JohnDow's question) (mesh 401 x 401).
27. Plate and cylinder - version 1 (mesh 401 x 401).
28. Plate and cylinder - version 2 (closer) (mesh 401 x 401).
29. Plate and cylinder in grounded casing - version 1 (plate and cylinder have the same potential) (mesh 401 x 401).
30. Plate and cylinder in grounded casing - version 2 (plate and cylinder have different potentials) (mesh 401 x 401).

Comparison of computation time (DEMO_XY) for two environments: Laptop and Desktop.

Desktop

CPU - Intel(R) Core(TM) i5-9500F 3.0 GHz (4.4 GHz max turbo frequency)
MS Windows 10 Pro
32GB RAM
SSD disk
MSYS2, ucrt
gcc 13.2.0

Laptop (rather old, A.D. 2012)

Lenovo G580
CPU - Intel(R) Core(TM) i3-2370M 2.40 GHz
Linux Mint 21.1 Vera
Linux version 5.15.0-116 generic
6GB RAM
gcc 11.4.0

Command to measure process execution time (for problem No. 1):

Linux:

time -p ./DEMO_XY.run 1

Windows (MSYS2, UCRT64):

time -p ./DEMO_XY.exe 1

Exact values of measuments can vary +/- 0.5s.

Conclusions

• 12 years old laptop can perform single thread computations about 60 percent longer than modern desktop with twice higher CPU and RAM clock.
• However, sometimes this advantage disappears. Some configurations (e.g. octupole in a grounded housing) are calculated in a similar time.
• On Desktop enviromnent these results were possible to obtain thanks to new version of MinGW-w64. On older MinGW output operations were executed much slower and advantage was not such significant.
• Meshes with edges with fixed potentials (e.g. grounded casing) are calculated faster than meshes "open to the outside".
• Liebmann uses the simplest relaxation alghorithm. In the past, algorithm optimization was very important on slower computers.

DEMO_ZR - gallery

work in progress...

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