CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Turbulence model for two phase incompressible flow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 31, 2016, 08:30
Question Turbulence model for two phase incompressible flow
  #1
Member
 
Yuanchuan Liu
Join Date: Oct 2012
Posts: 31
Rep Power: 12
SailorLiu is on a distinguished road
Dear Foamers,

I am trying to solve two phase (water and air) incompressible problems using interFoam. Basically, it is about floating structures in wind and waves. I have been using the kOmegaSST turbulence model. But I recently found that there is a large amount of turbulence near the free surface. I searched the forum and found one similar thread.
Quote:
There is no density in the formulation of the turbulence models, which leads to a huge diffusion of turbulence across the interface. This excess diffusion of turbulence (typically from air to water) dampens the wave very, very fast. In my case of studying wave breaking on a sloping beach, it lead to a dissipation of the wave energy without wave breaking - the wave simply disappeared.
It seems that density should be added to the k and omega equations. I browsed the code for the kOmegaSST model in OF2.4.x and density indeed is not included.

Does anybody know how to deal with this problem? Should I write my own turbulence model to include density into the turbulence euqations? Any help is appreciated.

Best wishes,

Yuanchuan Liu
SailorLiu is offline   Reply With Quote

Old   April 2, 2016, 17:40
Default
  #2
New Member
 
CH Xu
Join Date: Jan 2013
Posts: 6
Rep Power: 11
neytirilover is on a distinguished road
AFAIK the density*alpha term was added in KOmegaSST model in OF version 3.0.0, I don't know about previous versions tho, it might be easier just to upgrade to 3.0.0, than to write your own code and reinvent the wheel.
neytirilover is offline   Reply With Quote

Old   April 4, 2016, 08:53
Default
  #3
Member
 
Yuanchuan Liu
Join Date: Oct 2012
Posts: 31
Rep Power: 12
SailorLiu is on a distinguished road
Hi neytirilover,

Thank you very much for your reply. I also read about the implementation of the new turbulence framework in OF-3.0.x. However, I am not quite sure how it can be used in the interFoam solver.

I tried a very simple case in OF-3.0.x, but it seems the solver is still using the old SST model without the density term as I only need to specify the scheme for the div(phi, k) term rather than a div(rhoPhi, k). If the turbulence equations have included the density term, at least it should request a discretisation scheme for the corresponding terms?

Do you know if the new updated turbulence model is enabled automatically for all solvers or further modification to the solver/case is needed?

Best wishes,

Yuanchuan Liu
SailorLiu is offline   Reply With Quote

Reply

Tags
turbulence model, two phase flow

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
Discrete Phase Model, outlet mass flow rate does not fit edu_aero FLUENT 29 February 3, 2020 09:38
Wrong flow in ratating domain problem Sanyo CFX 17 August 15, 2015 07:20
K - epsilon VS SST turbulence model Maicol Main CFD Forum 0 November 30, 2012 17:25
Combustion Chamber flow - turbulence model folek FLUENT 0 April 13, 2010 16:58
How to activate just one phase turbulence model? Trodeme FLUENT 1 January 26, 2007 15:50


All times are GMT -4. The time now is 23:02.