Restoring Surface Tension Model Option in VOF Problem – Lesson 7

In solving a VOF problem with Coupled Level Set, I click the Surface Tension tab of the Phase Interactions and find that I cannot set the Continuum Surface Force and Continuum Surface Stress surface tension models. Instead, the only options are Wall Adhesion and the value of the surface tension coefficient. How can I restore the surface tension model option?

When the Coupled Level Set option is selected for VOF, a revised surface tension formulation is used internally. CSS/CSF are therefore disabled in the Phase Interactions. The Level Set option is helpful in cases where surface tension effects are strong enough to destabilize the numerics, but offers less customization.