CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Pool Boiling Eulerian RPI Model Vapor Volume Fraction Problem

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 5, 2019, 09:58
Default Pool Boiling Eulerian RPI Model Vapor Volume Fraction Problem
  #1
New Member
 
tumer
Join Date: Jan 2019
Posts: 2
Rep Power: 0
tumerkan10 is on a distinguished road
Hello everyone;

I am working on Eulerian RPI Model for pool boiling. I used to work on VOF before, but the results of the Twall were not satisfied with my experiment so i choose rpi model to validate experimental results.
Firstly, i faced with the some diverge problems. In explicit method for volume fraction, When i try fine mesh (near the boundary 0.05 mm) it diverges very fast(variable time step, global courant number 2 min time step 1e-7 max 5e-5).So i tried to 0.3mm mesh size near the boundary, Twall, and Qevap was okay, but for vapor volume fraction was like this;
https://i.ibb.co/KszM4CT/3.jpg
My models and correlations are;
https://i.ibb.co/ctNnjGD/1.jpg
I read other articles, i tried their correlations(drag, heat , lift etc), but vapor volume fraction did not change.
For same geometry, when i use VOF, the vapor volume fraction is like that;
https://i.ibb.co/NxNC6JY/2.jpg
Our model, heat flux from side wall;
https://i.ibb.co/QfgnmzN/2.jpg
How can i see bubbles in rpi model?

Last edited by tumerkan10; July 6, 2019 at 12:55. Reason: wrong links
tumerkan10 is offline   Reply With Quote

Old   July 7, 2019, 13:36
Default tutorial
  #2
New Member
 
tumer
Join Date: Jan 2019
Posts: 2
Rep Power: 0
tumerkan10 is on a distinguished road
if you have a tutorial about rpi model, please share with me
e-mail:tumerkanvural@gmail.com
tumerkan10 is offline   Reply With Quote

Reply

Tags
bubble, eulerian, multiphase, rpi model

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
Two-phase Eulerian model for nucleate subcooled boiling Edy OpenFOAM 5 February 11, 2017 17:21
RPI wall boiling model bogesz CFX 4 January 4, 2013 03:35
RPI Boiling model. ashokbarik FLUENT 0 April 5, 2010 04:23
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14
HELP!:CFD modelling using FLUENT in swimming pool Tee Main CFD Forum 0 September 7, 2005 21:48


All times are GMT -4. The time now is 10:48.