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-   -   Low temperature limit when iterations are done. (http://www.cfd-online.com/Forums/fluent/39847-low-temperature-limit-when-iterations-done.html)

MANOJKUMAR February 27, 2006 04:46

Low temperature limit when iterations are done.
 
Hi I am doing the combustion analysis using the liquid fuel pentane. the fuel temperature is 303K and air temperature is 650 K. After few iteration has occured than the message comes that" temperature limit to 1.0000K in 3cells in Zone 4".Still iterations are going on but how to remove this message.

thanks a lot.

Robin February 27, 2006 08:35

Re: Low temperature limit when iterations are done
 
Hi, did anyone reply you with this ? coz i am facing the same problem as you. Do hope to seek help from you if anyone has replied you. thanks lots dude!

Robin

MANOJKUMAR February 28, 2006 01:08

Re: Low temperature limit when iterations are done
 
No still no one give ans. if any one give ans i send u. MANOJKUMAR

kiran kumar February 28, 2006 02:22

Re: Low temperature limit when iterations are done
 
hi manoj oil droplets absorb energy from surrounding cell and gets evaporated .so that the surrounding cell temperature drastically drops.it will happen to only few cells nothing to worry.If you model droplet evaporation or wet combustion this messages will come. try to limit the temperature to room temp or higher one in the limits panel in fluent solver.


Ahmed February 28, 2006 16:30

Re: Low temperature limit when iterations are done
 
This is because the solver has produced temperatures less than 1 K (most probably negative values) and because this is physically impossible (on the absolute scale), the temperature is limited to the minimum value which is 1 k. If the solution is converging then keep it running otherwise you have to reduce the Energy underrelaxation factor.


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