# How to solve "temperature limited to 1.000000e+00 in 114 cells on zone 19 in domain 1

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 March 19, 2017, 12:38 How to solve "temperature limited to 1.000000e+00 in 114 cells on zone 19 in domain 1 #1 New Member   Heng Kok Nguan Join Date: Dec 2016 Posts: 4 Rep Power: 8 Hi all, I had this problem upon calculation, May I know how to solve this problem? My simulation is about a double pipe cylindrical heat exchanger with constant heat on the surface of the outerpipe. The heat exchanger is only modelled 1/4 to take advantage of the cylindrical symmetry. The water is pumped through the "water-inlet" and allowed to flow to the bottom of heat exchanger and flow back up and exits via "water-outlet". The outer pipe is surrounded with earth rock where its temperature is 383 K. The flow is turbulent. Can anyone help? Thank you. water inlet v = 0.5m/s t = 283 K surface of outer pipe = 383 K the outer pipe is surrounded with earth rock where its temperature is 383 K. the flow is turbulent

March 19, 2017, 18:23
#2
Senior Member

Kushal Puri
Join Date: Nov 2013
Posts: 182
Rep Power: 12
Quote:
 Originally Posted by heng94 Hi all, I had this problem upon calculation, May I know how to solve this problem? My simulation is about a double pipe cylindrical heat exchanger with constant heat on the surface of the outerpipe. The heat exchanger is only modelled 1/4 to take advantage of the cylindrical symmetry. The water is pumped through the "water-inlet" and allowed to flow to the bottom of heat exchanger and flow back up and exits via "water-outlet". The outer pipe is surrounded with earth rock where its temperature is 383 K. The flow is turbulent. Can anyone help? Thank you. water inlet v = 0.5m/s t = 283 K surface of outer pipe = 383 K the outer pipe is surrounded with earth rock where its temperature is 383 K. the flow is turbulent
This type of warnings are due to highly skewed elements (bad mesh). One way is just check the location where this warning is coming and remesh that region with good quality mesh.

If you want to proceed with the same mesh, just turn off the secondary gradient of the temperature by typint the following command in TUI

typpe the above command along with brackets and continue your run.

All the warnings will go after some iterations.

 March 22, 2017, 03:30 #3 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,575 Rep Power: 64 Try a better initial guess.

 March 29, 2017, 14:26 #4 New Member   Heng Kok Nguan Join Date: Dec 2016 Posts: 4 Rep Power: 8 Hi. Thanks for your reply. I had check my skewness quality with a maximum of 0.75. I'm using multizone method with hexa/prism mesh. I had already typed (rpsetvar 'temperature/shell-secondary-gradient? #f) in TUI command but the same problem with temperature being limited still exist. Please help. thank you. Last edited by heng94; March 29, 2017 at 16:46.

 March 29, 2017, 15:51 #5 New Member   Heng Kok Nguan Join Date: Dec 2016 Posts: 4 Rep Power: 8 A better initial guess? Do you mind to explain further? Thank you very much

October 18, 2019, 11:24
#6
Member

Join Date: Sep 2017
Posts: 44
Rep Power: 8
Quote:
 Originally Posted by heng94 Hi all, I had this problem upon calculation, May I know how to solve this problem? My simulation is about a double pipe cylindrical heat exchanger with constant heat on the surface of the outerpipe. The heat exchanger is only modelled 1/4 to take advantage of the cylindrical symmetry. The water is pumped through the "water-inlet" and allowed to flow to the bottom of heat exchanger and flow back up and exits via "water-outlet". The outer pipe is surrounded with earth rock where its temperature is 383 K. The flow is turbulent. Can anyone help? Thank you. water inlet v = 0.5m/s t = 283 K surface of outer pipe = 383 K the outer pipe is surrounded with earth rock where its temperature is 383 K. the flow is turbulent
Hi Heng94, did you manage to solve the problem?
If yes, please tell how did you do it

Best

September 6, 2022, 09:27
#7
Super Moderator

Sijal
Join Date: Mar 2009
Posts: 4,552
Blog Entries: 6
Rep Power: 53
Quote:
 Originally Posted by m.uzair Hi Heng94, did you manage to solve the problem? If yes, please tell how did you do it Best
I dont know what is causing problem in your case. But I managed to solve this problem by making proper mesh. By proper I mean I reduced the sudden change in mesh size in solid zone and made it almost uniform.

 Tags heat exchanger, temperature limited, turbulent

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Conan ANSYS 20 September 15, 2021 06:25 hsezsz CFX 2 October 13, 2016 07:58 [snappyHexMesh] SnappyHexMesh for internal Flow vishwa OpenFOAM Meshing & Mesh Conversion 24 June 27, 2016 09:54 volleyHC CFX 5 April 3, 2016 06:41 zore Main CFD Forum 0 June 19, 2013 10:16

All times are GMT -4. The time now is 05:30.

 Contact Us - CFD Online - Privacy Statement - Top