Temperature limited to problem.

gauravkmr · December 7, 2021, 10:18

Hi everyone,
I am simulating a pipe flow system with inlet temperature and mass flow water with properties changing with temperature. I have made udf for properties. Pipe have a central rod in it where it is generating a constant heat flux in the inner boundary wall of rod. Flow is flowing with a constant pressure of 25 MPa..
When I start the calculations, after 10-15 iterations it is showing temperature limited to..problem with higher limit to some cells and lower limit to some cells... I am monitoring the volume average temperatures of rod. It is increasing and not remain constant.. The other residuals are converged. In post processing the temperature profile of rod is very absurd, with high values of temperature upto 1000 deg Celsius, while it should be around 450-500 deg Celsius. What should I do??

evcelica · December 7, 2021, 12:48

Check your material properties and inlet/outlet flows and temps and energy balances.

Try using standard constant property water to see if material properties are incorrect.

gauravkmr · December 12, 2021, 07:38

Thanks for the reply, I have checked everything but still it is giving the same problem

anan12345 · December 27, 2021, 01:03

Did you try to run the simulation without UDF?

December 7, 2021, 10:18	Temperature limited to problem.	#1
gauravkmr New Member Gaurav Kumar Join Date: Jan 2018 Location: Delhi Posts: 17 Rep Power: 8	Hi everyone, I am simulating a pipe flow system with inlet temperature and mass flow water with properties changing with temperature. I have made udf for properties. Pipe have a central rod in it where it is generating a constant heat flux in the inner boundary wall of rod. Flow is flowing with a constant pressure of 25 MPa.. When I start the calculations, after 10-15 iterations it is showing temperature limited to..problem with higher limit to some cells and lower limit to some cells... I am monitoring the volume average temperatures of rod. It is increasing and not remain constant.. The other residuals are converged. In post processing the temperature profile of rod is very absurd, with high values of temperature upto 1000 deg Celsius, while it should be around 450-500 deg Celsius. What should I do??

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Mesh& steptime independant: conduction-convection problem	Fati1	Main CFD Forum	1	October 28, 2018 13:52
problem in temperature and liquid fraction value in the udf	durg	FLUENT	0	October 23, 2018 01:52
the problem that gradually change of temperature contour in coal gasification	bluenail	FLUENT	0	November 10, 2014 02:41
UDF for Back-flow Temperature	G340	Fluent UDF and Scheme Programming	3	August 21, 2013 04:56
Problem when adding temperature to interFoam	houkensjtu	OpenFOAM	4	November 5, 2012 02:35

December 7, 2021, 12:48		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	Check your material properties and inlet/outlet flows and temps and energy balances. Try using standard constant property water to see if material properties are incorrect.

December 12, 2021, 07:38		#3
gauravkmr New Member Gaurav Kumar Join Date: Jan 2018 Location: Delhi Posts: 17 Rep Power: 8	Thanks for the reply, I have checked everything but still it is giving the same problem

December 27, 2021, 01:03		#4
anan12345 New Member Join Date: Jun 2021 Posts: 13 Rep Power: 4	Did you try to run the simulation without UDF?