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

2 Phases with same parameters, any diffusion?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 14, 2020, 08:25
Default 2 Phases with same parameters, any diffusion?
  #1
New Member
 
Join Date: Feb 2016
Posts: 2
Rep Power: 0
-Kai- is on a distinguished road
Hi!

Iím struggling with what seems to be a pretty basic problem. Iím simulating a wash out kinetic in a fluidic device, I want to see how phase 1 is replaced by new injected phase 2. Both have the same physics, both of liquid water at the same temperature. My question is now if there is any diffusion? Or did I basically switched those off because I used for both phases the same properties?

Kind regards
Kai
-Kai- is offline   Reply With Quote

Old   January 28, 2020, 09:47
Default Model dependent
  #2
Senior Member
 
vinerm's Avatar
 
Vinerm
Join Date: Jun 2009
Location: Nederland
Posts: 2,948
Blog Entries: 1
Rep Power: 31
vinerm will become famous soon enough
Hi

That depends on the model used. if both the fluids belong to same phase as multiple species or components, then by default there is a diffusion coefficient applied. You may set it to very small value. If both fluids are treated as separate phases, then there is no diffusion by default since that would require mass transfer in the phase interaction.
__________________
Regards,
Vinerm

PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.
vinerm 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
how to obtain mass diffusion coefficient with UDF? Weiqiang Liu FLUENT 0 May 28, 2019 12:32
How to read multiphase parameters in creatFields from Transportproperties ? Amirhosseinesh OpenFOAM Programming & Development 4 October 12, 2018 10:28
Parameters rhoSimpleFoam marcus85 OpenFOAM Pre-Processing 0 May 15, 2013 09:36
implementation of diffusion coefficients and use of diffusion coefficients stephan OpenFOAM Running, Solving & CFD 0 February 28, 2010 14:30
Numerical diffusion error Z.Zeng Main CFD Forum 8 October 22, 1999 09:06


All times are GMT -4. The time now is 09:08.