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

vector plot in muliphase?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 24, 2002, 01:58
Default vector plot in muliphase?
  #1
Tasuio
Guest
 
Posts: n/a
Hi all,

I use CFX5.5 to learning about mixing between air and water in Tee Junction.I use velocity boundary condition in water inlet(100% water,0%air) and air inlet(100%air,0%water) and average pressuer is uesd in outlet. I have some problem in post-process,

- when plot velocity vector of water,in the air inlet have some vector in this zone but in this zone the volumefraction is zeor. In other,when i plot vector of air,in the water inlet have the arrow in this zone too. I don't understand why in this zone have the vector while in that zone is don't have air or water.

- In initial conition can i use 0% air and 0% water?

- when the slover in finish, in out-file is show the Re. how it calculate? [I mean where of the Re(inler,outlet,etc.) and base in what?(diameter,length,etc)]

I hope that have anyone can help me in that problem.

Regards,

Tasuio
  Reply With Quote

Old   September 27, 2002, 01:00
Default Re: vector plot in muliphase?
  #2
Michael
Guest
 
Posts: n/a
Hi Tasuio, CFX-5 assumes that each control volume contains all fluids. When you specify 100% air, there is actually a very small amount of water as specified by the Minimum Volume Fraction setting. For numerical reasons you can't have exactly 0 for the volume fraction. This shouldn't effect your simulation since the Minimum Volume Fraction is very small. The Reynolds number is based on the length scales that are given near the start of the out file. Hope this helps Mike
  Reply With Quote

Old   September 29, 2002, 08:17
Default Re: vector plot in muliphase?
  #3
Tasuio
Guest
 
Posts: n/a
Thank you Michael for you answer.
  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
Volume fractions in muliphase model mange FLUENT 2 May 11, 2015 08:20
Problems with BCs in muliphase flow with water falling from a reservoir Paul_l FLUENT 2 March 11, 2011 05:59


All times are GMT -4. The time now is 08:00.