Evolution of multi-mode Rayleigh-Taylor instability towards self-similar turbulent mixing
The evolution of the multimode Rayleigh-Taylor instability of nearly incompressible fluids, with density ratio r = 2, is investigated by means of two-dimensional hydrodynamic simulations. The study focuses on the effect of the initial perturbation on the evolution towards turbulent mixing. It is shown that, for sufficiently large times, a self-similar mixing regime occurs, in which typical spatial scales (such as the size of the mixed layer) evolve proportionally to g(t-t(0))(2), where g is the gravity, t the time, and t(0) is a characteristic time depending on the initial conditions. A model for the prediction of t(0) is then presented which is in agreement with the simulations.
Bibliographic Reference: Report: RT/NUCL/92/32 EN (1992) 12 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
Record Number: 199310971 / Last updated on: 1994-11-29
Original language: en
Available languages: en