Abstract
This paper discusses developments in two-phase flow induced vibrations research particularly recent findings within the Ecole Polytechnique FSI Chair. Two-phase flow excitation mechanisms include fluidelastic instability, turbulence and quasi-periodic excitation. The latter is a newly discovered phenomenon which is yet to be fully understood; high frequency quasi-periodic behavior may turn out to be important in practice. Significant progress has been made in understanding fluidelastic instability. In particular it has been shown that existing single phase flow based models may be applicable if used with care. Other important developments include better understanding of two-phase damping and as well as the development of a void fraction model which makes it possible to quantify two-phase flows in tube bundles with very good accuracy. Many of these developments remain, however, at the research stage and are yet to make it to practical application.
