So I need to calculate the simulation from the beginning (first iteration) or just continue from last calculation then changed the approach into transient solver? Because of the lower mesh for this particular case, I use steady-state solver and it works well, but when I increase the mesh into doubled, it turns away into swinging like the picture that I provided in the last comments. Do you know why it could possibly happen in boiling case?

Thank you for your kind responses.

Best regards,