Problem with phase separation in t-junction

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

 February 20, 2013, 04:47 Problem with phase separation in t-junction #1 New Member   Elin Stenmark Join Date: Feb 2013 Posts: 1 Rep Power: 0 Hi, I am trying to simulate two phase flow of air and water in a vertical t-junction with a horizontal branch. All parts of the junction have inner diameter 50 mm and are 500 mm long. There is one inlet which is located at the bottom of the junction and two outlets. I have velocity inlet with known velocities and volume fractions (air: 5m/s and 0.58 volume fraction, water: 6.21m/s). I have a known overall flow split (20/80 in branch/main arm) so first I tried outflow for outlet boundary conditions. I have also simulated using pressure outlet. As my phases are mixed I am using the Eulerian multiphase model. I'm running transient simulations and have tried both implicit and explicit formulation of volume fraction equation. My primare phase is air. For turbulence I am using the realixable k-epsilon with enhanced wall treatment. I have enabled gravity and surface tension modelling. I have tried both coupled and segregated solver and first and second order descretization for momentum/energy equations. For volume fraction equation I've been using HRIC. Now finally to my problem; I get no phase separation in my simulations! There should be more air flowing in to the branch but in my simulations I get almost 50/50 of air and water in the entire domain. All simulations converge (I have 1e-5 for convergence criteria and I run the simulations until mass flow out equals mass flow in). Does anybody have an idea on what the problem can be? To my knowledge, Eulerian should be the most suitable multiphase model as the phases mix. I have tried refining the mesh but I still get the same problem. Any ideas/comments would be greatly appreciated! Sorry for the long post... Regards, Elin

 August 8, 2013, 01:17 #2 Member   EMAVI V SURYA SAMPATH Join Date: Aug 2011 Location: Malaysia Posts: 85 Rep Power: 8 Did your problem got solved ?

 June 3, 2014, 20:18 #3 New Member   ali91 Join Date: Jun 2014 Posts: 3 Rep Power: 5 i also get the same problem

 Tags fluent, multiphase, phase separation

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Danial Q Main CFD Forum 1 July 10, 2014 14:41 hakim22 FLUENT 0 July 31, 2011 10:28 Ram Dayal CFX 2 August 8, 2006 23:07 senthil FLUENT 5 May 21, 2003 02:55 Fred G. Kang Main CFD Forum 1 October 14, 1998 11:41

All times are GMT -4. The time now is 02:33.