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

mixing of 2 different fluids

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 27, 2010, 12:34
Question mixing of 2 different fluids
  #1
New Member
 
Florin Saceleanu
Join Date: Feb 2010
Posts: 12
Rep Power: 16
flo777 is on a distinguished road
I want to know how to mix 2 different fluids. I have enabled the beta options for multi-domains, but then when I create the 2 domains, I can only select the assembly as the location. The error I am getting is that the same boundary has been assigned to more than one domain.
Can anyone tell me how to get over this problem?
flo777 is offline   Reply With Quote

Old   February 28, 2010, 18:53
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
What do you mean by "mix 2 fluids"? CFX has dozens of models to handle different regimes of mixing. Free surface models, Eularian models, particle tracking, additional variables, fluidised bed models etc etc. Until you explain what you are doing we can't help.
ghorrocks is offline   Reply With Quote

Old   February 28, 2010, 20:15
Default
  #3
New Member
 
Florin Saceleanu
Join Date: Feb 2010
Posts: 12
Rep Power: 16
flo777 is on a distinguished road
I am new to CFX, don't know of what it is capable, but what I am trying to do is show the mixing between air and octane gas at specified velocities.

The boundaries on the geometry I have created has 2 inlets and 1 outlet. I thought it's as easy as enabling the beta features, and creating 2 different domains for each inlet, but then the domain location interferes and I don't know how to deal with that. I also don't know how to deal with the outlet, which is a mixture of air and octane.

Thanks.
flo777 is offline   Reply With Quote

Old   February 28, 2010, 20:22
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
You don't define different domains for each component. It is one domain with a multi component mixture.

Have a look in the tutorial examples. There are plenty of examples of how to do multi component mixtures.
ghorrocks is offline   Reply With Quote

Old   February 28, 2010, 20:37
Default
  #5
New Member
 
Florin Saceleanu
Join Date: Feb 2010
Posts: 12
Rep Power: 16
flo777 is on a distinguished road
Thanks for quick reply.

I heard that CFX also has break-up models? I would also like to model liquid octane injection, and see the mixture between the air and the spray.

Could I do this with a single domain and multiple component mixture? Do you know if there are tutorials on break-up models?

Thanks
flo777 is offline   Reply With Quote

Old   February 28, 2010, 21:04
Default
  #6
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Yes, CFX has breakup models. They were developed for fuel injection for SI and CI engines and if you are using liquid octane they may be useful.

But make sure you know what you are talking about. Mixtures of gasses can be modelled with multicomponent mixtures. Breakup of liquid sprays is now a multiphase thing as you have liquid and gaseous phases. Multiphase and multicomponent are totally different. And yes, you can have both a multiphase AND multicomponent models where the gas phase is a mixture of gasses. These are complicated models and not for the feint hearted.
ghorrocks is offline   Reply With Quote

Old   March 8, 2010, 23:40
Default break-up model
  #7
New Member
 
Florin Saceleanu
Join Date: Feb 2010
Posts: 12
Rep Power: 16
flo777 is on a distinguished road
Do you know where I could get a tutorial explaining the break-up model?
I just want to get started with this, so the very basic, if there is something like that.. as I mentioned before, I want to model a certain mass flow of liquid octane, injected at a certain pressure
thanks
flo777 is offline   Reply With Quote

Old   March 9, 2010, 05:27
Default
  #8
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
You will have to contact CFX support to get an example.
ghorrocks 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
2 diferent fluids mixing Figd84 FLUENT 12 October 2, 2009 03:24
Mixing of two different fluids in a swirl AK FLUENT 3 July 11, 2007 08:32
mixing of non reacting miscible fluids Himanshu Arora FLUENT 0 June 13, 2005 05:17
FIDAP-Properties Definition in Fluids Mixing Area Q. Hao FLUENT 0 February 17, 2005 13:00
turbulent mixing of two fluids ulrich bieder Main CFD Forum 2 October 9, 1999 17:15


All times are GMT -4. The time now is 07:12.