CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

no value changes during transient simulation

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   January 9, 2016, 13:29
Default no value changes during transient simulation
  #1
wsh
New Member
 
Dobromił Pszenny
Join Date: Jul 2015
Posts: 20
Rep Power: 3
wsh is on a distinguished road
Dear CFD Online users,

I am working on simple 2d heat transfer and solidification model. Model contains two cell zones - layer of pcm material surrounding oil pan and oil pan itself. Steady analysis worked fine, but my goal is to examine how long does it takes for pcm to completly solidify and to see how temperature is distributed over time, so I'v changed mode to transient and set up some animation. Unfortunately, it seems like heat flow is stopped - I can't noticed any value change over time.

What am I doing wrong? Cas file in attachment.


https://www.virustotal.com/en/file/f...is/1452359733/
Attached Files
File Type: zip oil_pan_fluent.zip (120.7 KB, 1 views)
wsh is offline   Reply With Quote

Old   January 9, 2016, 18:00
Default
  #2
New Member
 
Jura
Join Date: Jan 2016
Posts: 1
Rep Power: 0
47 awtomat is on a distinguished road
Im having same issue. Modelling simple 3d grow-box with several vents and do want see temperature distribution over time -steady analysis works, transient not, please help
47 awtomat is offline   Reply With Quote

Old   January 12, 2016, 14:03
Default
  #3
wsh
New Member
 
Dobromił Pszenny
Join Date: Jul 2015
Posts: 20
Rep Power: 3
wsh is on a distinguished road
please someone help me
wsh is offline   Reply With Quote

Old   January 13, 2016, 10:51
Default
  #4
Senior Member
 
Join Date: Mar 2014
Posts: 367
Rep Power: 5
hwet is on a distinguished road
not changing transient results mean the solution has reached a steady state. i see running wrong in that. transient results will at some time reach steady state as well.

imagine opening your rooms door, the temperature change inside the room is a transient process but will eventually reach steady state.
hwet is offline   Reply With Quote

Old   January 13, 2016, 12:13
Default
  #5
wsh
New Member
 
Dobromił Pszenny
Join Date: Jul 2015
Posts: 20
Rep Power: 3
wsh is on a distinguished road
Transient simulation approach steady state after ten 10-sec time steps? Dont think so. Moreover, temperaure at both cellzones doesnt change at all and its level is equal to initialization temperature (310 K for example). Temp at whole cell zones is constant, this is not steady state
wsh is offline   Reply With Quote

Old   January 13, 2016, 16:46
Default
  #6
Senior Member
 
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 1,372
Rep Power: 20
LuckyTran will become famous soon enough
Quote:
Originally Posted by wsh View Post
Transient simulation approach steady state after ten 10-sec time steps? Dont think so. Moreover, temperaure at both cellzones doesnt change at all and its level is equal to initialization temperature (310 K for example). Temp at whole cell zones is constant, this is not steady state
If you have two cell zones make sure you have interfaces between them.
LuckyTran is offline   Reply With Quote

Old   January 13, 2016, 17:22
Default
  #7
wsh
New Member
 
Dobromił Pszenny
Join Date: Jul 2015
Posts: 20
Rep Power: 3
wsh is on a distinguished road
"Interface" between them is a wall type boundary condition. Actually 2 bc, because fluent automatically creates a shadow boundary condition - is that correct? I've set up a "coupled" condition.
wsh is offline   Reply With Quote

Reply

Tags
animation, heat transfer, solidification, time, transient

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question on transient simulation in OpenFOAM and FLUENT nicklj OpenFOAM Running, Solving & CFD 4 May 8, 2014 22:30
Transient RANS Simulation Bazinga Main CFD Forum 3 May 8, 2014 14:37
Transient simulation diverges Graduation ANSYS 0 February 28, 2012 08:13
How to integrate variable in a transient simulation? nprace CFX 4 January 9, 2012 09:59
Beginning a Transient Simulation Norflow CFX 2 October 7, 2011 00:38


All times are GMT -4. The time now is 20:52.