Self-consistent decay of superfluid turbulence

Recent experiments have shown that the isothermal turbulent motion of heliu m II is very similar to classical turbulence. This regime is characterized by a strong coupling. between the superfluid vortex tangle and the normal-f luid component. To study this coupled regime we develop an approach to comp ute the evolution of the vortex tangle. Its key feature is that it is dynam ically self-consistent, unlike previous approaches, because it takes into a ccount the back rection of the vortex tangle onto the normal fluid. We impl ement this approach and study a model system which, although very idealized , gives some insight into the transfer of energy between the two fluid comp onents.