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Zoubayr
Mauritius
11 Posts |
 Posted - Feb 15 2022 : 17:13:57
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Hello, I am a physics undergraduate student using FastCap2 for my project works. I am having problems on how to find the capacitance between 2 square capacitor of 10 cm and a distance of 1 mm separating them. The permissivity being #949;_0. Can somebody please help?
Z.soopun |
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Zoubayr
Mauritius
11 Posts |
Posted - Feb 15 2022 : 17:15:29
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the permissivity being the vacuum permissivity (epsilon note)
Z.soopun |
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Enrico
538 Posts |
Posted - Feb 15 2022 : 20:41:23
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Please see the samples files in the Samples directory when you install the FastFieldSolver bundle.
Best,
Enrico
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Zoubayr
Mauritius
11 Posts |
Posted - Feb 22 2022 : 19:30:21
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quote:
Originally posted by Enrico
Please see the samples files in the Samples directory when you install the FastFieldSolver bundle.
Best,
Enrico
I wanted to know if the sample files are present in the sample directory of FastModel?
Z.soopun |
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Enrico
538 Posts |
Posted - Feb 22 2022 : 23:24:58
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No, FasterCap. See the embedded online help for the location.
Best,
Enrico |
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Zoubayr
Mauritius
11 Posts |
Posted - Feb 23 2022 : 13:57:25
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quote:
Originally posted by Enrico
No, FasterCap. See the embedded online help for the location.
Best,
Enrico
Where are the embedded online help for location found?
Z.soopun |
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Enrico
538 Posts |
Posted - Feb 23 2022 : 17:28:34
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When you open FastCap2 (GUI version for Windows) or FasterCap, just go to the 'Help' menu and select 'Help topics'
Best,
Enrico
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Zoubayr
Mauritius
11 Posts |
Posted - Feb 23 2022 : 18:06:58
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quote:
Originally posted by Enrico
When you open FastCap2 (GUI version for Windows) or FasterCap, just go to the 'Help' menu and select 'Help topics'
Best,
Enrico
Thank you so far for your help dear Enrico but I am still having difficulties to navigate my way through FastCap. Could you please help me in my work to generate the Capacitance Matrix for 2 square capacitors each of length 10 cm and width of 10 cm and separated by a distance of 1 mm? #949; = #949;_o.
Regards,
Soopun Zoubayr
Z.soopun |
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Zoubayr
Mauritius
11 Posts |
Posted - Feb 23 2022 : 18:08:58
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p.s the permittivity being the Permittivity of free space (or vacuum permittivity) (epsilon note)
Z.soopun |
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Zoubayr
Mauritius
11 Posts |
Posted - Feb 28 2022 : 10:34:48
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quote:
Originally posted by Enrico
When you open FastCap2 (GUI version for Windows) or FasterCap, just go to the 'Help' menu and select 'Help topics'
Best,
Enrico
Dear Enrico I was able to know the algorithm needed but I am unable to generate both the capacitance matrix and the diagram.
Regards,
Zoubayr
Z.soopun |
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Enrico
538 Posts |
Posted - Feb 28 2022 : 11:16:02
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Were you able to find the example files?
I report here the parallel plate simple capacitor example to be used in FasterCap:
File "capacitor_simple.lst"
* Simple parallel plate capacitor
*
*
* This capacitor is made by two square metal contacts
* embedded in an homogeneous dielectric medium
*
* If fringing fields are neglected, the capacitance as per analytical formula
* is e0*er*S/d where S is the surface of the armors and d is their distance.
* In this case S = 1, d = 0.01, er = 1, therefore C = 8.854e-12 * 1 * 1 / 0.001 = 8.854e-9
*
* Remark: given the high geometrical ratio 1:1000 between the plate side and
* the plate distance, for proper solution convergence you need to set FasterCap's
* '-d' parameter to 0.1 or lower values.
*
*
* lower contact
C plate.txt 1.0 0.0 0.0 0.0
* upper contact
C plate.txt 1.0 0.0 0.0 0.001
File "plate.txt"
0 1x1 unit square conducting plate
*
Q 1 0.00000e+000 0.00000e+000 0.00000e+000 1.00000e+000 0.00000e+000 0.00000e+000 1.00000e+000 1.00000e+000 0.00000e+000 0.00000e+000 1.00000e+000 0.00000e+000
For your case, you need to modify the plate.txt to be 0.1m x 0.1m instead of 1m x 1m; separation is already 1mm.
Mind the node in the comments about the -d parameter.
Best Regards,
Enrico
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Zoubayr
Mauritius
11 Posts |
Posted - Mar 02 2022 : 17:32:43
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quote:
Originally posted by Enrico
Were you able to find the example files?
I report here the parallel plate simple capacitor example to be used in FasterCap:
File "capacitor_simple.lst"
* Simple parallel plate capacitor
*
*
* This capacitor is made by two square metal contacts
* embedded in an homogeneous dielectric medium
*
* If fringing fields are neglected, the capacitance as per analytical formula
* is e0*er*S/d where S is the surface of the armors and d is their distance.
* In this case S = 1, d = 0.01, er = 1, therefore C = 8.854e-12 * 1 * 1 / 0.001 = 8.854e-9
*
* Remark: given the high geometrical ratio 1:1000 between the plate side and
* the plate distance, for proper solution convergence you need to set FasterCap's
* '-d' parameter to 0.1 or lower values.
*
*
* lower contact
C plate.txt 1.0 0.0 0.0 0.0
* upper contact
C plate.txt 1.0 0.0 0.0 0.001
File "plate.txt"
0 1x1 unit square conducting plate
*
Q 1 0.00000e+000 0.00000e+000 0.00000e+000 1.00000e+000 0.00000e+000 0.00000e+000 1.00000e+000 1.00000e+000 0.00000e+000 0.00000e+000 1.00000e+000 0.00000e+000
For your case, you need to modify the plate.txt to be 0.1m x 0.1m instead of 1m x 1m; separation is already 1mm.
Mind the node in the comments about the -d parameter.
Best Regards,
Enrico
Hello once again Dear Enrico,
When I am trying to run the algorithm you provided in the reply the following is appearing:
Running fastcap 2.0 (18Sep92)
Input: C:\Users\Farook Soopun\Documents\capacitor_simple.lst
No title line beginning with '0' found, assuming PATRAN input file
zero element request in file `fastcap\patran.c' at line 143
assign_names: no conductor names specified
I am unable to generate the capacitance matrix
Regards,
Zoubayr
Z.soopun |
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Zoubayr
Mauritius
11 Posts |
Posted - Mar 02 2022 : 17:34:42
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could you please help?
I will be really grateful.
Regards,
Zoubayr
Z.soopun |
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Enrico
538 Posts |
Posted - Mar 02 2022 : 18:37:42
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Hi Z.,
I said FasterCap, not FastCap
Regards,
Enrico
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Zoubayr
Mauritius
11 Posts |
Posted - Mar 03 2022 : 20:46:42
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Dear enrico,
Thank you for your precious help. I wanted to that while using fastercap can only use the provided algorithm or can i write my own algorithm also?
Regards,
Zoubayr
Z.soopun |
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Enrico
538 Posts |
Posted - Mar 07 2022 : 17:07:37
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Of course you can. The source files are all open, you can pull them from Github, see the link in the download page, and modify them as you prefer.
Best Regards,
Enrico
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Topic |
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Capacitance between 2 square capacitors
