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

Multiphase flow with species transport

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 29, 2013, 14:33
Default Multiphase flow with species transport
  #1
New Member
 
Join Date: Jul 2013
Posts: 2
Rep Power: 0
hassism is on a distinguished road
I am new to CFD and am attempting to quickly learn how to numerically model my physical experiments.

I am attempting to model a saline density current which develops from a lock-exchange mechanism and flows into ambient, fresh water. My 3D domain includes a downstream reach and an upstream reach with an interface connecting the two. Initially, I will have dense, saline in the upstream reach, and fresh water in the downstream reach.

Models in use: VOF, LES, Species.

I have created a material (salt) and have 2 phases (fresh water, and fresh water + salt). That is, my primary phase (fresh water) is only fresh water, and my secondary phase has two species (fresh water and salt).

After initializing my solution, I patch the following:

-volume fraction of secondary phase (saline) to 1 for upstream zone.
-volume fraction of secondary phase to 0 for downstream zone.
-salt mass concentration to 0.035 for the upstram zone.

I would expect from this that the initial density of the upstream zone be greater than that of the downstream zone. However, I find that the initial downstream zone density is correct (998.2 kg/m3), but the upstream zone has a very low initial density which changes if I change the patched mass concentration.

Any ideas of why this may be happening? Any help for this beginner would be greatly appreciated.
hassism is offline   Reply With Quote

Reply

Tags
density current, fluent, multiphase, species transport, vof

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
questions about species transport through walls shuqin FLUENT 13 April 9, 2014 02:42
Questions for a species transport problems (snapshots attached) aleisia FLUENT 2 October 9, 2011 04:40
Some quiestions on multiphase flow fjalil CFX 4 June 17, 2009 12:32
multiphase flow ,phoenics user forum ismail Phoenics 0 October 23, 2008 19:26
Multiphase flow for flow around ship gundul CFX 5 September 2, 2008 16:06


All times are GMT -4. The time now is 02:59.