QUICK QUESTION: How it comes !!!

meshoxx · August 5, 2013, 08:22

Hi all ,
Something weird was going on fluent. I have been simulating heat exchanger (tube bank) problem. When setting the B.C's I set the temperature of the cylinders to 343.15 but after iterating to some residual when doing surface integral to the cylinder to just check the temperature THE TEMPRATURE OF THE CYLINDERS WAS NOT AS I SET AS A BOUNDARY CONDITION !!!!!

please reply if you know the solution

I thought that maybe there are not enough nodes on the surface of the cylinders but as I increased the nodes the difference still huge (like 25c)

meshoxx · August 7, 2013, 21:38

Really no one can answer !!

vasava · August 8, 2013, 01:21

Did your case converge properly? Put some pictures of the mesh and temperature distribution.

sampathevs · August 8, 2013, 01:30

yes, it might not yet converged properly.!

Check the result after obtaining some convergence.

meshoxx · August 9, 2013, 07:23

Uploaded with ImageShack.us

Hi
I tried to do a sanpshot of all thing. All the residuals are belowe 10-7 and still the specified bounddary condition doesnt match with the computed one

flotus1 · August 9, 2013, 07:49

Have a look at the definition of the total temperature in fluent.
Then evaluate the static temperature instead.

meshoxx · August 9, 2013, 15:13

I will do

Thank you so much to all who replyed

August 5, 2013, 08:22	QUICK QUESTION: How it comes !!!	#1
meshoxx New Member Mfm Join Date: Jun 2013 Posts: 18 Rep Power: 12	Hi all , Something weird was going on fluent. I have been simulating heat exchanger (tube bank) problem. When setting the B.C's I set the temperature of the cylinders to 343.15 but after iterating to some residual when doing surface integral to the cylinder to just check the temperature THE TEMPRATURE OF THE CYLINDERS WAS NOT AS I SET AS A BOUNDARY CONDITION !!!!! please reply if you know the solution I thought that maybe there are not enough nodes on the surface of the cylinders but as I increased the nodes the difference still huge (like 25c)

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August 7, 2013, 21:38		#2
meshoxx New Member Mfm Join Date: Jun 2013 Posts: 18 Rep Power: 12	Really no one can answer !!

August 8, 2013, 01:21		#3
vasava Senior Member Paritosh Vasava Join Date: Oct 2012 Location: Lappeenranta, Finland Posts: 732 Rep Power: 22	Did your case converge properly? Put some pictures of the mesh and temperature distribution.

August 8, 2013, 01:30		#4
sampathevs Member EMAVI V SURYA SAMPATH Join Date: Aug 2011 Location: Malaysia Posts: 85 Rep Power: 14	yes, it might not yet converged properly.! Check the result after obtaining some convergence.

August 9, 2013, 07:49		#6
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,398 Rep Power: 46	Have a look at the definition of the total temperature in fluent. Then evaluate the static temperature instead.

August 9, 2013, 15:13		#7
meshoxx New Member Mfm Join Date: Jun 2013 Posts: 18 Rep Power: 12	I will do Thank you so much to all who replyed