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

Problem setting up Condensation

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 24, 2014, 04:37
Default Problem setting up Condensation
  #1
cwl
Senior Member
 
Chaotic Water
Join Date: Jul 2012
Location: Elgrin Fau
Posts: 435
Rep Power: 17
cwl is on a distinguished road
Hi everyone

I am trying to model condensation of vapor on air streams. Case description: 2D axisymmetric cylinder with air inlet at one end (10 C; average velocity 0.3 m/s, set as MassFlow boundary condition), outlet at another end (Pressure outlet boundary condition) and an additional inlet for steam on the wall (50 C; average velocity 3 m/s).

Models: // not all, but the important ones
Implicit Unsteady
VOF: multi-component gas (vapor + air), multi-component liquid (water)
Antoine Equation for Saturation Pressure of Water
Condensation set at Phase Interaction (Primar Phase - water)
Surface Tension
Time-Step 0.01 s // whatever

Without Condensation model set at Phase Interaction everything is fine (see img.); but when this model is turned on - Temperature drops to 0 K at vapor inlet (see img.) and no condensation occurs at all (Volume Fraction of Water is strictly zero everywhere).

I have no idea, why this happens - neither physical explanations, nor computational i've got.

If anyone has any idea or a simple working case of condensation (no film) - i would appreciate yor help greatly.

Last edited by cwl; February 9, 2021 at 02:10.
cwl is offline   Reply With Quote

Old   April 29, 2014, 03:10
Post
  #2
New Member
 
Join Date: Jan 2014
Posts: 13
Rep Power: 12
Miki12 is on a distinguished road
Hi cwl,

I'm doing the same kind of simulation, do you try to remove the surface tension model? Do you try with evaporation? I have the same problem as you, I have no creation of water.
I have asked the people from CD-Adapco, they told me to pue at the initial, a very little amount of water.

Do you try with another approach ( fluid film, lagrangian, eulerian-eulerian) ?

Thank you,

Miki,
Miki12 is offline   Reply With Quote

Old   September 1, 2017, 06:35
Default
  #3
New Member
 
mike
Join Date: Aug 2013
Posts: 11
Rep Power: 12
raskolnikov is on a distinguished road
Do you have any solutions for this problem? I see also no phase change for a same flow simulation.
raskolnikov 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
Problem setting C_MU_T with DEFINE_ADJUST Andy FLUENT 3 June 22, 2018 02:53
Problem? with Installation of OpenFOAM 2.1.0 on to Ubuntu 10.4.4 VirtualBox Stubby OpenFOAM Installation 8 March 5, 2012 15:12
Problem setting regions danigorgeos STAR-CCM+ 2 March 1, 2012 06:15
UDF for condensation problem Mahesh FLUENT 8 March 31, 2011 12:07
Chem. Reaction and Ignition Setting in ICE Problem Tulus Siemens 0 March 28, 2005 00:02


All times are GMT -4. The time now is 15:47.