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

Two Phase Flow Problem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 13, 2010, 22:41
Default Two Phase Flow Problem
  #1
New Member
 
Jami Tullius
Join Date: Jun 2010
Posts: 2
Rep Power: 0
miner15kick is on a distinguished road
I am trying to model a simple channel with a two phase system. I have read all the material and forums and included my suggesting in my simulations yet i still have not been able to obtain my solution.

I have a simple channel where i input water and on the bottom surface i apply a constant heat flux. I have tried both inhomogeneous and homogeneous models.

For homogeneous model, i use the default materials water at 25 C and water vapor at 100C as the continuous and dispersed components. Looking at the results I my fluid properties are not changing with phase change and i cannot obtain vapor quality.

LIQUID EVAPORATION MODEL
For the inhomogeneous model i include the default H2O, H2Ol, and H2Ovl, and include a variable composition mixture of H2O and Ideal Gas. When i model this i get no convergence my simulations crashes. I have changed the parameters to help better convergence but nothing helps.

Is there another way to model a simple two phase flow problem?

Please HELP.

Thanks
miner15kick is offline   Reply With Quote

Old   July 14, 2010, 08:29
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,825
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
What are you trying to do? Model evaporation or boiling? Phase change of what - droplets, a body of fluid?
ghorrocks is offline   Reply With Quote

Old   July 14, 2010, 10:04
Default
  #3
New Member
 
Jami Tullius
Join Date: Jun 2010
Posts: 2
Rep Power: 0
miner15kick is on a distinguished road
I am trying to model thermal effects of the channel as the fluid is flowing through. Based on some preliminary findings, the water should be boiling.
miner15kick is offline   Reply With Quote

Old   July 14, 2010, 18:58
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,825
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
You should look at the boiling tutorial files which come with CFX. If you need further help contact CFX support for example files closer to what you are modelling. Boiling models are tricky to set up so you will probably need some help there.
ghorrocks is offline   Reply With Quote

Old   October 28, 2010, 11:01
Default
  #5
New Member
 
Join Date: May 2010
Location: Tehran, Iran
Posts: 20
Rep Power: 7
Reza_computational is on a distinguished road
Is there any example file for different problem setups? If any how can I reach them? I need something on water evaporation in which water is modeledd as dispersed fluid...
Reza_computational is offline   Reply With Quote

Old   October 28, 2010, 18:03
Default
  #6
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,825
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
As I said, contact CFX support as they have a number of example files which may help.
ghorrocks is offline   Reply With Quote

Reply

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
how 2 freeze 1 phase flow field & start lagrangian KK CFX 5 February 14, 2008 17:48
error in two phase flow problem mvee FLUENT 0 March 28, 2007 05:17
Two-phase/ Single phase mix flow Reza Main CFD Forum 1 August 6, 2003 06:36
Poiseuille flow problem Rosie FLUENT 1 December 6, 2002 17:52
Two phase flow problem M.Shannag FLUENT 2 December 29, 2001 13:43


All times are GMT -4. The time now is 21:18.