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 Capacitance between 2 square capacitors
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Zoubayr

Mauritius
11 Posts

Posted - Feb 15 2022 :  17:13:57  Show Profile  Reply with Quote
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

Zoubayr

Mauritius
11 Posts

Posted - Feb 15 2022 :  17:15:29  Show Profile  Reply with Quote
the permissivity being the vacuum permissivity (epsilon note)

Z.soopun
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Enrico

529 Posts

Posted - Feb 15 2022 :  20:41:23  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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

529 Posts

Posted - Feb 22 2022 :  23:24:58  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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

529 Posts

Posted - Feb 23 2022 :  17:28:34  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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

529 Posts

Posted - Feb 28 2022 :  11:16:02  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
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  Show Profile  Reply with Quote
could you please help?

I will be really grateful.

Regards,
Zoubayr

Z.soopun
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Enrico

529 Posts

Posted - Mar 02 2022 :  18:37:42  Show Profile  Reply with Quote
Hi Z.,

I said FasterCap, not FastCap

Regards,
Enrico
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Zoubayr

Mauritius
11 Posts

Posted - Mar 03 2022 :  20:46:42  Show Profile  Reply with Quote
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

529 Posts

Posted - Mar 07 2022 :  17:07:37  Show Profile  Reply with Quote
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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