[Nartasan]

Hi all,

I'm trying to simulate an oil droplet in a microscale water tube without touching the walls in the meantime. My sim is based on Multiphase/VoF model and need to use csf model in solver. I'm using AVL Fire and now have some issues and questions:

1. when I active the csf option and put the correct values of "contact angle" and "Surface tension coefficient" my runs diverge. while the simulation goes pretty well when I don't activate csf option.

2. I know that contact angle define when there is a wall with a normal vector on the surface of the oil(in this case), but what if I don't have any contact with wall right now....should I assume only an imaginary parallel wall with real wall and find the contact angle based on that? or I should only use two fluids model and not vof?

3. if I want to define the surface tension as an output variable for checking its values over time, should I use csf method and assume surface tension as a body force and then right e new subroutines?

Could you please help me I'm new in this field.