CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Specifying volume/Mass fraction in Species Transport for problem without inlet

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

LinkBack Thread Tools Display Modes
Old   January 9, 2011, 11:56
Default Specifying volume/Mass fraction in Species Transport for problem without inlet
New Member
Join Date: Nov 2010
Posts: 2
Rep Power: 0
tanjinjack is on a distinguished road

Strictly a beginner with limited experience in FLUENT. I am trying to model a simple Species Transport problem that does not involve any reactions. It's a humidity problem.

You can imagine it as a box (actual geometry is more complex) with air of a given humidity inside. Few holes are poked at some places and a heat source is introduced inside the box. The aim is to find out how the humidity end up with the heat source being active chasing the water vapour out through those holes, after it reaches equilibrium.

I can't seem to be able to specify my mass fraction or volume fraction for my fluid (air+water vapour). Some readings on the manual and some searches on the forum show that I may consider using patching or the source term. Which is more probable? Source term is a function of time, is it applicable to my problem (I just want to know the end result, not how it changes)?

Also, I am thinking to use 'pressure outlet' for the holes (my outlets) around the box. However, I think there will still be a flow of water vapour into the box at equilibrium. (Or the heat source will just heat away all the water vapour, isn't it?) Any other boundary conditions I can use?

Will appreciate any advices and helps here.
Thanks a lot.

-jin jack-
tanjinjack is offline   Reply With Quote

Old   October 9, 2011, 04:42
Default problem to define another fluid in mass flow inlet
New Member
Join Date: Jan 2011
Posts: 10
Rep Power: 6
amirmohebbi is on a distinguished road
dear all
I am new in fluent
how i can define all of my mesh zone stagnation air
and mass flow inlet another flow like that fuel
then i have to the mixing rate of them
please help me?
thanks for your attention
amir mohebbi
amirmohebbi is offline   Reply With Quote


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
Fixed Bed Gasifier, Species Transport Problem therandomestname FLUENT 11 May 8, 2011 09:20
PB: Saving mass fraction of species on two points with an udf biget.a FLUENT 2 July 23, 2009 03:06
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14
PROBLEM: Scalar mass fraction Lorenzo CD-adapco 1 July 14, 2008 03:50
Can Fluent handle species transport in multi-phase Roger FLUENT 1 January 30, 2003 20:12

All times are GMT -4. The time now is 23:16.