Browsing by Author "Lezzi, Adriano"
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Item Examples of Air-Entraining Flows(The Physics of Fluids, 1992-04) Oguz, H.N.; Prosperetti, Andrea; Lezzi, AdrianoFour examples of air?entraining flows at the free surface of a liquid are briefly considered: (a) the transient impact of a jet, (b) the application of an excess pressure, (c) two counter?rotating vortices below the surface, and (d) a disturbance on a vortex sheet.Item Rayleigh-Taylor Instability for Adiabatically Stratified Fluids(The Physics of Fluids, 1989-11) Lezzi, Adriano; Prosperetti, AndreaA linear analysis of the effects of compressibility on the stability of two superposed isentropic fluids is presented. The results of the analysis, which differ from those available in the literature for other unperturbed stratifications, are illustrated with several numerical examples. It is found that, in the present conditions, compressibility has a stabilizing effect at small wavelengths and a destabilizing effect at long wavelengths. The magnitude of these effects is, however, small in most circumstances. A physical basis for the interpretation of the results is also described in qualitative terms. This discussion sheds some light on the nature of the differences between the present results and those relative to the case of isothermal stratification.