Hilary Egglestone
Subscriber

1) Thank-you for the comment on the mesh. 

2) The properties for high pressure air were defined only in the patching window as follows: 

and the operating conditions are as follows: 

3) The turbulence model used is k-omega: 

and the time step is as follows:

I also tried running it with the following fixed time step and the results look the same: 

4)  VOF Selection: 

Your help is much appreciated, thank you!