Karthik R
Administrator
Hello,nThese are two different ways of modeling surface tension force at the interface of the two fluids. Having said that, they are completely different mathematical formulations. On one hand this force is modeled as a volumetric source term in the momentum equation and in the other, the surface tension force is modeled as a surface stress tensor. nThe results you obtain also will depend on the type of grid you use. nI'd say this - if CSF works for you and you are satisfied by the results, I'd say continue using the CSF formulation.nIf you have not looked into the theory guide on the mathematical formulation: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/flu_th/flu_th_vof_surf_tens.htmlnThanks.nKarthikn