inlet temperature = outlet temperature

March 17, 2006, 03:59

Hi !

Anyone knows how to set as inlet temperature (in a velocty inlet bc) the value of the outlet temperature (mass weighted average) during the computation ? UDF ? Scheme in command ??

ThanX

March 17, 2006, 08:36

Is there any particular reason for this? From a very simple point of view one could argue: inlet temp. = outlet temp. -> adiabatic case -> no need to solve energy equation at all.

RoM

March 17, 2006, 09:34

It is not an adiabatic case at all. In fact, I want to simulate the flow in a cavity with many walls with different temperatures. Moreover, I would like to set the inlet temperature (in my velocity-inlet condition) as the value of the outlet temperature, which is unkwown before solving the case ! I want to do this because in the real life, the outlet of my cavity is connected to its inlet...but I don't simulate that. OK, I can do this manually, but I would prefer an automatic process. Any idea ??

ThanX

March 17, 2006, 09:58

In this case a DEFINE_PROFILE udf can do the job. If radiation is involved in your calculation you should be very careful while setting a temperature with DEFINE_PROFILE. Your solution will probably diverge if the temperature changes are too high.

Good Luck, RoM

March 17, 2006, 10:14

Thank you very much...I will try this.

Thierry.

March 17, 2006, 03:59	inlet temperature = outlet temperature	#1
Thierry Guest Posts: n/a	Hi ! Anyone knows how to set as inlet temperature (in a velocty inlet bc) the value of the outlet temperature (mass weighted average) during the computation ? UDF ? Scheme in command ?? ThanX

March 17, 2006, 08:36	Re: inlet temperature = outlet temperature	#2
RoM Guest Posts: n/a	Is there any particular reason for this? From a very simple point of view one could argue: inlet temp. = outlet temp. -> adiabatic case -> no need to solve energy equation at all. RoM

March 17, 2006, 09:34	Re: inlet temperature = outlet temperature	#3
Thierry Guest Posts: n/a	It is not an adiabatic case at all. In fact, I want to simulate the flow in a cavity with many walls with different temperatures. Moreover, I would like to set the inlet temperature (in my velocity-inlet condition) as the value of the outlet temperature, which is unkwown before solving the case ! I want to do this because in the real life, the outlet of my cavity is connected to its inlet...but I don't simulate that. OK, I can do this manually, but I would prefer an automatic process. Any idea ?? ThanX

March 17, 2006, 09:58	Re: inlet temperature = outlet temperature	#4
RoM Guest Posts: n/a	In this case a DEFINE_PROFILE udf can do the job. If radiation is involved in your calculation you should be very careful while setting a temperature with DEFINE_PROFILE. Your solution will probably diverge if the temperature changes are too high. Good Luck, RoM

March 17, 2006, 10:14	Re: inlet temperature = outlet temperature	#5
Thierry Guest Posts: n/a	Thank you very much...I will try this. Thierry.

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