Hello, thank you very much for your response

*1) Can you please provide more information or screenshot of geometry?*

**Here is my computational domain. There is an inlet on the lower surface, from where phase 2 is extruded into the model domain, the outlet is the upper surface (blue), from where phase 1 exits the domain to guarantee the incompressibility condition.**

2) *What is volume fraction of phase2?*

**phase2 is the lava Volume of fraction = 1**

**phase1 is the air Volume of fraction = 0**

3) *Please share the details of vof model and model use for phase interaction?*

**VOF model, implicite, implicite body force,Interface modelling Sharp + interfacial Anti-diffusion. I dont consider phase interaction. **

3) *How you patch phase 2 after initialization?*

**I suppose that at the initial time the model domain is filled by air(phase 1), hence there is no phase 2 in the model domain.**

Thank you very much for your help!