| Author |
 Topic  |
|
|
Dshih
Taiwan
5 Posts |
 Posted - Oct 10 2023 : 17:45:34
|
Hi fellows,
I am now trying to calculate the capacitance of parallel plate.
(two 2*2 plates, separation is 4)
And I found that user_duide has mentioned a command: "capgen".
I directly using it, but there is an error.
Can anyone teach me how to fix it.
code:
0 parallel plate capacitor
capgen -n2 -e1.0 -s4.0 | fastcap
thank you |
|
|
Enrico
530 Posts |
Posted - Oct 10 2023 : 18:15:02
|
Hi Dshih,
are you using *nix or the Windows / DOS porting?
Best,
Enrico
|
 |
|
|
Dshih
Taiwan
5 Posts |
Posted - Oct 11 2023 : 19:40:21
|
Hi Enrico,
I use windows system.
Besides, I'm learning how to use "T", "Q" commands.
So, in my case, can I directly coding like this? or I have to fix it in another way?
code:
0 parallel plate capacitor
Q plane1 0.0 0.0 2.0 2.0 0.0 2.0 0.0 2.0 2.0 2.0 2.0 2.0
Q plane2 0.0 0.0 -2.0 2.0 0.0 -2.0 0.0 2.0 -2.0 2.0 2.0 -2.0
thank you |
|
|
|
Enrico
530 Posts |
Posted - Oct 13 2023 : 11:09:00
|
Hi Dshih,
you cannot use the generators (e.g. capgen) inside an input file.
The generators are small programs intended to be launched from the shell (in Windows case, from the DOS shell or if you prefer also from the PowerShell) and output a text file that can be used, or incorporated, in a geometry description file for FastCap / FasterCap.
Originally designed for Unix, we ported them for DOS. Note that in the DOS case, you cannot use the pipe (i.e. |) as DOS works a bit differently from *nix. You should redirect the output to a file, e.g.
capgen -n2 -e1.0 -s4.0 > myfile.qui
and use the "myfile.qui" in your simulation(s).
Best,
Enrico
|
|
|
|
Dshih
Taiwan
5 Posts |
Posted - Oct 15 2023 : 17:26:39
|
Hi Enrico,
Thank you for your reply, I'll try "capgen" again.
Can I ask you that I know the first line of the file must be start with "0", but I get feedback of the output said:
read_list_file: bad line format, Line 1:
0 test model
my code (I save it as a .qui file):
0 test model
*
Q plane1 0.0 0.0 2.0 2.0 0.0 2.0 0.0 2.0 2.0 2.0 2.0 2.0
Q plane2 0.0 0.0 -2.0 2.0 0.0 -2.0 0.0 2.0 -2.0 2.0 2.0 -2.0 |
Edited by - Dshih on Oct 15 2023 17:29:54 |
|
|
|
Enrico
530 Posts |
Posted - Oct 16 2023 : 08:57:33
|
This is usually caused by running the file as a list file ("-l" option, that is the default). To run directly a geometry definition file you must un-select the -l option.
Best,
Enrico
|
|
|
|
Dshih
Taiwan
5 Posts |
Posted - Oct 17 2023 : 19:12:06
|
Hi Enrico,
I have unselected the "list file", but it seems I got something wrong with my code.
I found my input file was not two parallel planes in the fastmodel(I choose "dsiplay as solid" to check it). It looks like two planes but missing a quarter of triangle (both of them).
code:
0 parallel planes
*
Q plane1 0.0 0.0 2.0 2.0 0.0 2.0 0.0 2.0 2.0 2.0 2.0 2.0
Q plane2 0.0 0.0 -2.0 2.0 0.0 -2.0 0.0 2.0 -2.0 2.0 2.0 -2.0
Thank you for answering my questions.
Sorry for any mistake, English is not my native language. |
Edited by - Dshih on Oct 17 2023 19:15:16 |
|
|
|
Enrico
530 Posts |
Posted - Oct 17 2023 : 23:35:34
|
Look at the corner coordinates. They should be in CW or CCW order, they are instead in random order. The quadrilateral folds on itself with the order you specified.
Best,
Enrico |
|
|
| |
Topic |
|
|
|
how to using command "capgen"
