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

temperature losing region

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

Like Tree1Likes
  • 1 Post By Steffen595

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 23, 2015, 21:02
Default temperature losing region
  #1
Senior Member
 
Join Date: Mar 2014
Posts: 375
Rep Power: 13
hwet is on a distinguished road
Hi
Can I make a region inside my volume where the gas will rapidly lose temperature depending on the regions temperature as it passes through it.

This is not the same as making the walls a different temperature, also if i patch a region with a temperature that will only be an initialization. I want this region to constantly have a low temperature.
hwet is offline   Reply With Quote

Old   July 24, 2015, 02:15
Default
  #2
Senior Member
 
Join Date: May 2012
Location: Melbourne
Posts: 161
Rep Power: 13
Steffen595 is on a distinguished road
cant you just put in a subdomain and make it a heat source. Then chose a negative value? I can try and pull my heat source model out later on today.
hwet likes this.
Steffen595 is offline   Reply With Quote

Old   July 24, 2015, 20:00
Default
  #3
Senior Member
 
Join Date: May 2012
Location: Melbourne
Posts: 161
Rep Power: 13
Steffen595 is on a distinguished road
I tried, works. Temperature is sinking. I had 2 models for a buoyancy simulation. One with heated walls and one with a 2nd domain and a heat sourc. If I make the heat flux a negative value, the temperature drops.
Steffen595 is offline   Reply With Quote

Old   July 24, 2015, 23:59
Default
  #4
Senior Member
 
Join Date: Mar 2014
Posts: 375
Rep Power: 13
hwet is on a distinguished road
how can i relate the heat flux to the temperature, i cant just put in a random negative value can i.
For me the gas passes through a zone with water at 24 C, since I am not doing this as a multiphase simulation and just considering the gas, I want it to lose its temperature as it would to water in that zone if water was there and this was a miultiphase simulatiion. Hope I make sense
hwet is offline   Reply With Quote

Old   July 25, 2015, 00:38
Default
  #5
Senior Member
 
Join Date: May 2012
Location: Melbourne
Posts: 161
Rep Power: 13
Steffen595 is on a distinguished road
you have to put in some heat flux in kW per m^2 on that boundary wall where the gas touches the water. Pipe surface or whatever you are using.
http://www.cfd-online.com/Forums/cfx...et-outlet.html

thats the thread I startes on a simular topic. You can make a fluid domain and have a wall with heat flux per m^2. Or make 2 domains, one is a heat source with heat flux per m^3.
Steffen595 is offline   Reply With Quote

Old   July 25, 2015, 01:33
Default
  #6
Senior Member
 
Join Date: Mar 2014
Posts: 375
Rep Power: 13
hwet is on a distinguished road
OK thanks, I will try this
hwet is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I use fvOptions to couple a solid region and a fluid region? titanchao OpenFOAM Running, Solving & CFD 4 January 14, 2022 08:55
whats the cause of error? immortality OpenFOAM Running, Solving & CFD 13 March 24, 2021 08:15
Temperature condition inside an entire region Twinsen_cfd STAR-CCM+ 2 November 20, 2014 04:36
High temperature methane+air Peter FLUENT 5 January 26, 2009 19:04
An issue with temperature change in unsteady prob Ashok kumar FLUENT 1 January 13, 2009 05:34


All times are GMT -4. The time now is 08:43.