I'm involved in 2D/3D modelling of stratified and intermittent two phase flows in horizontal, vertical and inclined ducts.

I've more especially worked on VOF method until now ... Comparisons with experimental data have shown that regime changes (annular, slug, wavy, bubbly, ...) are not well predicted (friction is not well taken into account).

According to your experience, is it better to try to modify VOF method (throught UDF) or rather to consider euler/euler approach ?

Any interesting paper to suggest ?

Hi, I feel you must try using Eulerian-Eulerian fluid model. Also gustimate the secondary phase volume fraction beforehand to decide which model u want to use. In eulerian model u have various drag models and i think it might be a best bet for ur case.

If u have any doubts, please reply back.

Madhavan