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

Multi phase flow properties

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

Like Tree1Likes
  • 1 Post By vinerm

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 1, 2020, 21:07
Default Multi phase flow properties
  #1
New Member
 
Join Date: Jul 2018
Posts: 24
Rep Power: 4
aminhgn is on a distinguished road
Hello,

I am trying to use UDF to define my properties. The problem is 2 phase flow (Liquid Desiccant-humid air). Since both flows are the mixture, I want to use define properties for the liquid desiccant flow but by define_properties loops over all cells. I want to loop over only liquid desiccant solution. for example for calling species which C_YI (c,t,0), I want to apply on liquid desiccant phase.

Thank you,
Amin
aminhgn is offline   Reply With Quote

Old   February 2, 2020, 05:55
Default Multiphase + Species Modeling
  #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
Are you using multiphase or species model or do you have both multiphase and species modeling enabled? As far as multiphase is concerned, each phase has its own property dialogue box. If you use a UDF, though it goes over each cell but Fluent ensures the properties of only that phase are changed to which UDF is hooked.
aminhgn likes this.
__________________
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

Old   February 6, 2020, 03:36
Default
  #3
New Member
 
Join Date: Jul 2018
Posts: 24
Rep Power: 4
aminhgn is on a distinguished road
Quote:
Originally Posted by vinerm View Post
Are you using multiphase or species model or do you have both multiphase and species modeling enabled? As far as multiphase is concerned, each phase has its own property dialogue box. If you use a UDF, though it goes over each cell but Fluent ensures the properties of only that phase are changed to which UDF is hooked.
Thank you for your kindly reply. My problem has been solved. I only have one more problem, I want to use DEFINE_SPECIFIC_HEAT to define my cp based on concentration and temperature. this function is :

DEFINE_SPECIFIC_HEAT( name, T, Tref, h, yi)
which i can use T instead of C_T function but what about C_YI which is concentration? How can I get my concentration in my function?



Regards,

Amin
aminhgn is offline   Reply With Quote

Old   February 6, 2020, 04:10
Default It is already there
  #4
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
In almost every (with few exceptions) DEFINE_ macro, it's only the first argument, i.e., the name of the function, that Fluent expects from the user. The values for the other ones are supplied by Fluent. So, you do not need either C_T or C_YI. Those values are already there in T and yi. You can use yi as it is. Do note that it is a vector, i.e., yi[0] will give mass fraction for the first species.
__________________
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
Bubble plume simulation, multi phase flow Artvandelay Main CFD Forum 5 August 23, 2018 04:52
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 06:21
How to simulate a multi phase flow striking a surface and causing it to wear?? pankajbhatter9 Main CFD Forum 0 November 2, 2013 14:11
Mass flow rate of phase in post mat_cfd CFX 0 September 3, 2013 08:55
Which software for modeling viscoelastic properties in a two phase flow? michaelb Main CFD Forum 9 February 17, 2011 16:27


All times are GMT -4. The time now is 07:24.