2D Axisymmetric Swirl VOF Simulation - Phase not changing
 

Hello,

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: https://www.youtube.com/watch?v=AsxaOl2BAgI

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

Phase Change
 

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.