CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

2D Axisymmetric Swirl VOF Simulation - Phase not changing

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

LinkBack Thread Tools Search this Thread Display Modes
Old   April 19, 2020, 19:13
Default 2D Axisymmetric Swirl VOF Simulation - Phase not changing
New Member
Join Date: Apr 2020
Posts: 1
Rep Power: 0
guilhermemd11 is on a distinguished road

I am a newcomer to Ansys Volume of Fluid simulations, so I will appreciate any help!

I am currently trying to simulate, using transient VOF, a 2D Axisymmetric model of a Pressure Swirl Injector. In this type of injector, the fluid enters through a number of tangential inlet ports (an image of the CAD of the injector is attached for better visualization). A PNG of the 2D Axisymmetric model is also attached, with inlet, outlet, walls and axis pointed out.

I followed the Ansys Tutorial Guide (version 18.0) for both an axisymmetric flow and for VOF Modelling. I also tried to mimic the procedure from several scientific papers I read.

What I am trying to obtain is something similar to this simulation:

The problem I am facing is that, when I calculate the posed problem, the volume fraction remains unchanged. To check if the problem was in the set up, I changed the solver from Axysimmetric Swirl to only Axysimmetric and changed the inlet boundary condition to axial velocity only, and it seems to have worked (even though the new simulation had nothing to do with the original problem).

I believe the problem may be with the velocity inlet boundary condition I used (also attached as a PNG image). Or not. I would like some insight, especially if some of you have already worked with a similar problem.

Thanks in advance
Attached Images
File Type: png Pressure Swirl Injector.PNG (130.0 KB, 16 views)
File Type: png Axisymmetric model.png (20.9 KB, 19 views)
File Type: png Inlet Boundary Condition.PNG (17.5 KB, 13 views)
guilhermemd11 is offline   Reply With Quote

Old   April 21, 2020, 04:14
Default Phase Change
Senior Member
vinerm's Avatar
Join Date: Jun 2009
Location: Nederland
Posts: 2,946
Blog Entries: 1
Rep Power: 36
vinerm will become famous soon enough
In CFD, user has to specify a model for the phase change. It will not change on its own. User needs to know the reason for phase change, such as, evaporation or cavitation or melting, etc. Accordingly, you need to specify a model for the same.

PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.
vinerm is offline   Reply With Quote


axisymmetry, injector, swirl, vof

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
Using Fluent VOF and Lee model to simulate mass transfer of two phase Albert Lee FLUENT 1 May 2, 2019 08:01
Axisymmetric swirl etgau8 STAR-CCM+ 3 January 9, 2017 06:03
swirl inlet velocity for a 2-d axisymmetric flow zahrarashidi OpenFOAM Running, Solving & CFD 2 January 12, 2015 07:01
two Phase column simulation chemeng OpenFOAM 3 August 18, 2010 12:53
phase changing simulation David Liu Main CFD Forum 3 October 25, 2004 01:43

All times are GMT -4. The time now is 23:55.