CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Multiphase Flow Properties varying with temperature!

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 28, 2016, 08:42
Default Multiphase Flow Properties varying with temperature!
  #1
New Member
 
Francesca Guardavaccaro
Join Date: Feb 2015
Posts: 9
Rep Power: 11
starlight is on a distinguished road
Hello everyone and thank you in advance for your help!

I have to simulate an internal multiphase flow with properties like density, dynamic viscosity, etc. varying with temperature.
So far it has been performed an isothermal simulation.
I would like to understand which is the best model setup and how to set/manipulate for example the polynomial density.
Unfortunately I'm not an expert and this post may be really confusing, sorry about that.
Anyone could help?! Star CCM+ manual is no longer helping me.

Last edited by starlight; April 28, 2016 at 10:05.
starlight is offline   Reply With Quote

Old   May 9, 2016, 17:12
Default
  #2
Senior Member
 
kevin alun
Join Date: Sep 2011
Location: Germany
Posts: 106
Rep Power: 14
marmot is on a distinguished road
I like to use the User Defined EOS, I create a table, simple csv file and import that below in tools, csv file looks like this T (K), rho (kg/m**3), mu (Pa-s), k (W/m2-K)

now for example density, select method Table(T)
set T and rho

I find working with tables easier than coming up with field functions or polynomials, its not slower in terms of CPU time
marmot is offline   Reply With Quote

Old   May 10, 2016, 11:58
Default
  #3
New Member
 
Francesca Guardavaccaro
Join Date: Feb 2015
Posts: 9
Rep Power: 11
starlight is on a distinguished road
Thank you very much for your reply! I'm trying working with user-defined EOS but I'm having some issues with calculation convergence!
starlight is offline   Reply With Quote

Old   May 11, 2016, 06:24
Default
  #4
Senior Member
 
kevin alun
Join Date: Sep 2011
Location: Germany
Posts: 106
Rep Power: 14
marmot is on a distinguished road
You might need to limit the min and max Temperature in the reference conditions. Than make sure your temperature dependent tables cover the temperature range you limit.

You might want to do things like gas phase is constant density, liquid phase is temperature dependent, does it converge, than try both.

Make sure your temp data is smooth, no large jumps and such

remember multiphase convergence is an art form, have fun
marmot is offline   Reply With Quote

Reply

Tags
eulerian multiphase model, multiphase temperature

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
[openSmoke] libOpenSMOKE Tobi OpenFOAM Community Contributions 562 January 25, 2023 10:21
Flow with periodic temperature Florian31 STAR-CCM+ 0 May 28, 2015 05:05
Difference in flow distribution of single phase and multiphase analysis shivasluzz CFX 0 April 22, 2015 23:54
is internalField(U) equivalent to zeroGradient? immortality OpenFOAM Running, Solving & CFD 7 March 29, 2013 02:27
error message cuteapathy CFX 14 March 20, 2012 07:45


All times are GMT -4. The time now is 05:39.