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

Stratified flow mixing with water

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 10, 2014, 23:40
Default Stratified flow mixing with water
  #1
New Member
 
KaiWang
Join Date: Nov 2014
Posts: 11
Rep Power: 12
Dragonuser is on a distinguished road
Hello, everyone. Recently I want to do a simulation on the mixing of two pipes.
The main pipe contains stratified flow and the branch pipe contains sub-cooled water. And condensation must be considerated.
I have read some papers and find that the NEPTUNE-CFD can do this, they used this to simulate the COSI experiment. But they have implemented many other models such as Large interface recognition model, three cells thick large interface method and so on.
Since I cannot obtain NEPTUNE_CFD(not open to others except EDF,CAE), I was wondering whether I can do things like this with other software like CFX ,or fluent or ccm+? And how? Should I also implement some models or should I just use the default model?
Thanks very much in advance.
Dragonuser is offline   Reply With Quote

Old   December 11, 2014, 00:34
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,864
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
CFX has extensive multiphase modelling capability so can probably do the simulation you describe. But you are describing a very complex multiphase model. It is not a simulation to be attempted by beginners.
ghorrocks is offline   Reply With Quote

Old   December 11, 2014, 02:16
Default
  #3
New Member
 
KaiWang
Join Date: Nov 2014
Posts: 11
Rep Power: 12
Dragonuser is on a distinguished road
I see. Is it possible that it can be done without implementing other models? ie, can I do that just with what it has in CFX?
Besides, if I just run a simulation without phase change, will it be more realistic to firstly run it out?
Dragonuser is offline   Reply With Quote

Old   December 11, 2014, 04:50
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,864
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
CFX has many multiphase models (mixing models, free surface models), and also has many phase change models. So it has the capability to model most flows.

You have not described what you are modelling so I cannot assess whether a model without phase change will be adequate.
ghorrocks is offline   Reply With Quote

Old   December 12, 2014, 23:16
Default
  #5
New Member
 
KaiWang
Join Date: Nov 2014
Posts: 11
Rep Power: 12
Dragonuser is on a distinguished road
Understood. I am now simulating an air-water stratified flow from main pipe mixing with water from branch pipe. I am using inhomogeneous free surface flow, but it cannot converge, I was just wondering how I can do something like this. I read something about the LIM(Large Interface Model) in Neptune _CFD. Is there something like LIM in CFX since I cannot get Neptune _CFD code.
[IMG]http://a2.qpic.cn/psb?/V10drRp30jvf3u/xaoY2H4JfrYkATyF*i04FHMtThN92ETFQaqvfASCuDs!/m/dNPUIuMsAAAAnull&bo=vgL6AAAAAAAFB2I!&rf=photolist& t=5[/IMG]
Dragonuser is offline   Reply With Quote

Old   December 13, 2014, 07:09
Default
  #6
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,864
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
I am not familiar with the large interface model or with Neptune CFD.

Have a look in the CFX documentation and see if the models it has available are suitable for you.
ghorrocks is offline   Reply With Quote

Reply

Tags
condensation

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
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 06:21
Discontinuity at water level in stratified 2 phase flow kbaker CFX 24 June 14, 2012 08:37
Two-phase air water flow problems by activating Wall Lubrication Force challenger85 CFX 5 November 5, 2009 06:44
Water vapour condensation in CFX-5.7.1 hdj CFX 1 November 27, 2005 08:15
Flow Mixing Shyam Main CFD Forum 0 December 28, 2003 14:15


All times are GMT -4. The time now is 23:31.