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semi infinte

Posted Feb 7, 2012, 12:38 a.m. EST Version 4.0a 3 Replies

hassan soliman
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Dear Ivar

I have infinte cable (3 m) and i want to study a sector (0.165 m) to get the temperture distribution

how can i define the boundary at the infinte end?

i.e how can i tell comsol that this end of cable is too long and infinte


thank you very much
3 Replies Last Post Feb 8, 2012, 8:07 a.m. EST
Edgar Kaiser
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Posted: 1 decade ago Feb 7, 2012, 4:49 a.m. EST
Hi,

I am not Ivar, but this is a forum and not meant for directly adressing specific people. You also enhance your chance of getting response by talking to the forum.

Regarding your question: This appears to be a typical case for a 2D study. This will automatically treat the cable like it was infinitely long and allow you to investigate the cross section.

Cheers
Edgar
Hi, I am not Ivar, but this is a forum and not meant for directly adressing specific people. You also enhance your chance of getting response by talking to the forum. Regarding your question: This appears to be a typical case for a 2D study. This will automatically treat the cable like it was infinitely long and allow you to investigate the cross section. Cheers Edgar
hassan soliman
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Posted: 1 decade ago Feb 7, 2012, 1:14 p.m. EST
Dear Sir

I am so sorry but i didn't meant to ask specific person ( but Ivar has replied my questions since 4 months)

regarding my question

i didn't describe my problem correctly

i have infiniite cable and i don't want to get cross section, i want to study a specific length from the whole length

how can i define the infint length at the boundries?
Dear Sir I am so sorry but i didn't meant to ask specific person ( but Ivar has replied my questions since 4 months) regarding my question i didn't describe my problem correctly i have infiniite cable and i don't want to get cross section, i want to study a specific length from the whole length how can i define the infint length at the boundries?
Edgar Kaiser
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Posted: 1 decade ago Feb 8, 2012, 8:07 a.m. EST

I don't know if there is a good solution to this. You might check whether 'infinite elements' can address the issue. I never used that so far.

But I want insist a bit on the 2D approach. If the following prerequisites are fulfilled:

- The cable is infinitely long, i.e. much longer than the 0.165 m you are interested in
- The structure of the cable is constant along its length
- The environment outside is constant along the cable

Then you will find constant values along the cable and you can simplify everything to 2D, no?

Cheers
Edgar
I don't know if there is a good solution to this. You might check whether 'infinite elements' can address the issue. I never used that so far. But I want insist a bit on the 2D approach. If the following prerequisites are fulfilled: - The cable is infinitely long, i.e. much longer than the 0.165 m you are interested in - The structure of the cable is constant along its length - The environment outside is constant along the cable Then you will find constant values along the cable and you can simplify everything to 2D, no? Cheers Edgar

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