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conduction??URGENT!!

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Old   June 13, 2007, 04:45
Default conduction??URGENT!!
  #1
Donia
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hi, i'm trying to simulate a 2D conduction model!for the BC i impose heating temperature for one side and cooling temperature on the other side!the two other walls are adiabatic!on fluxes report,normally i should have the same heat transfer flux on the two tempered walls (same dimensions) but the net flux is not null!! plz help i didn't find any explanation!! thx
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Old   June 13, 2007, 08:54
Default Re: conduction??URGENT!!
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charafeddine
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dear Donia, let me know if the two temperatures that you impose are the same yhank you
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Old   June 13, 2007, 10:31
Default Re: conduction??URGENT!!
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Donia
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hi charafeddine, temperatures are different unless how we 'll have the conduction! plz answer,it's so urgent!! thanks
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Old   June 13, 2007, 11:02
Default Re: conduction??URGENT!!
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bashu
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you have to run this till you get zero net flux, that's how you know it's converged. the resiuals are not the main indications fro convergence
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Old   June 13, 2007, 11:38
Default Re: conduction??URGENT!!
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Donia
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hi bashu, thanks for the idea!i tried it,the net flux is minimised but it can't reach 0,it's 0.02!! any other idea plz??
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Old   June 13, 2007, 17:30
Default Re: conduction??URGENT!!
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bashu
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you wil not reach absolute zero, but if the error (differnece / inlet) is below 1% (depends on the error you want you may go to 0.1%) the solution is converged. also you should monitor temperature at a point (or line or surface) and make sure it's not changing with iteraion much (again depends on the error you can accept)
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Old   June 14, 2007, 02:38
Default Re: conduction??URGENT!!
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Donia
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hi bashu, thanks a lot for your time and your patience!!last night i kept on trying and i reached an error of 0.1%!!every thing is ok:temperatures,fluxes,contours....!!it's perfect!! i owe you much!! thanks

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