Temperature problem

shubhankar.kulkarni55 · October 15, 2011, 10:48

Hi everyone!

I am having a problem of temperatures shooting up to a very high value after specifying 'source terms' or 'heat flux' value. The calculated values are verified. I also tried reducing the source term values, still the temperatures are not decreasing. Any suggestions?

Thanks!!

sabin · October 17, 2011, 06:11

Do following checks

1)make sure that units are consistent.
2) Check thoroughly value of Cp, k
3) If there is phase change in actual case apply 'limit' at that temp in Fluent.

Fluent will obey energy balance pretty accurately ..All the best

shubhankar.kulkarni55 · October 17, 2011, 06:50

Thanks a ton for your reply.

I am using the standard material database available in Fluent and also there is no phase change in the problem. I have tried reducing the source term value by 10 times, still the temperatures are not coming to be accurate! Please let me know if there can be any other problem!

Thanks again!

sabin · October 17, 2011, 07:02

Fluent database properties are defined for NTP. If your operating condition is different properties will be different. Check for that.

October 15, 2011, 10:48	Temperature problem	#1
shubhankar.kulkarni55 New Member Shubhankar Join Date: Jul 2011 Posts: 7 Rep Power: 14	Hi everyone! I am having a problem of temperatures shooting up to a very high value after specifying 'source terms' or 'heat flux' value. The calculated values are verified. I also tried reducing the source term values, still the temperatures are not decreasing. Any suggestions? Thanks!!

October 17, 2011, 06:50	Thanks!	#3
shubhankar.kulkarni55 New Member Shubhankar Join Date: Jul 2011 Posts: 7 Rep Power: 14	Thanks a ton for your reply. I am using the standard material database available in Fluent and also there is no phase change in the problem. I have tried reducing the source term value by 10 times, still the temperatures are not coming to be accurate! Please let me know if there can be any other problem! Thanks again!

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October 17, 2011, 06:11		#2
sabin New Member sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 14	Do following checks 1)make sure that units are consistent. 2) Check thoroughly value of Cp, k 3) If there is phase change in actual case apply 'limit' at that temp in Fluent. Fluent will obey energy balance pretty accurately ..All the best

October 17, 2011, 07:02		#4
sabin New Member sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 14	Fluent database properties are defined for NTP. If your operating condition is different properties will be different. Check for that.