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-   -   temperature limitation? (http://www.cfd-online.com/Forums/fluent/30138-temperature-limitation.html)

Deadly August 7, 2002 04:22

temperature limitation?
 
Im trying to run my full model, using symmetry..I initially ran my full model wihout having symmetry, emaning i drew out the whole geometry..and solved.. But when i draw the half model and start iterating, using symmetry, i find that i get message syaing a temperature limitation in a partucular zone with 6000 cells.. I do not get this when i run the full model, so by right i should not be getting that message with the symmetrical model right? Can someone shed some light on this? Thnk you

Deadly

Laika August 7, 2002 04:37

Re: temperature limitation?
 
Do you have this warning just during the first few iterations, or throughout the entire simulation?

Laika, still orbiting

ahmet August 7, 2002 07:35

Re: temperature limitation?
 
How is done combustion modelling in gas turbine combustor?

Newer, I can also predict pollutant formation, especially, NOx and CO emissions.


Puck August 7, 2002 09:48

Re: temperature limitation?
 
The first 4 iterations went fine..but after tht i had reversed flow for another 4 more iterations..From around the 10th iterations onwards i started having the temperature limitation thingy.. also, when i saw tht happening until my 18th iteration, i stopped iteratins, went to the limits panel and increased the temp limit to 50000..i know i shouldnt anyhow increase it, but i just wanted tio see how high the temperature hits...

Deadly August 7, 2002 10:00

Re: temperature limitation?
 
The first 4 iterations went fine..but after tht i had reversed flow for another 4 more iterations..From around the 10th iterations onwards i started having the temperature limitation thingy.. also, when i saw tht happening until my 18th iteration, i stopped iteratins, went to the limits panel and increased the temp limit to 50000..i know i shouldnt anyhow increase it, but i just wanted tio see how high the temperature hits... Somthing seems wrong..

P.S ..im using a different nick in sch and home..hope i didnt cause a nuisance by posting two same messages under different nick.. Apologies:P

Laika August 7, 2002 10:50

Re: temperature limitation?
 
-mostly the problem is not the temperature, but the velocity-field. Check your boundary settings

-never change the temperature limit, unless you are sure in reality you have temperatures of that magnitude.

Laika, still orbiting

Deadly August 7, 2002 22:29

Re: temperature limitation?
 
But the weird thing is..i dun get this problem when i run the full model.. Only when i run the symmetry(half model), i get this problem..My velocity setting are the same as that for the full model.

Kalai


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