Small-Scale Properties of Two-Dimensional Rayleigh-Taylor Turbulence etc15 Tracking Number 78Presentation: Session: Intermittency and scaling 1 Room: Room H Session start: 10:30 Tue 25 Aug 2015 Quan ZHOU qzhou@shu.edu.cn Affifliation: Shanghai University Topics: - Transport and mixing, - Intermittency and scaling Abstract: We report a high-resolution numerical study of small-scale properties of two-dimensional (2D) miscible Rayleigh-Taylor (RT) incompressible turbulence with the Boussinesq approximation at small Atwood number and unit Prandtl number. Our results show that the buoyancy force balances the inertial force at all scales below the integral length scale and thus validate the basic force-balance assumption of the Bolgiano-Obukhov scenario in 2D RT turbulence. We further examine other small-scale properties of 2D RT turbulence, such as temporal evolution of energy and thermal dissipation rates, the emergence of intermittency and anomalous scaling for high order moments of velocity and temperature differences, distributions of local dissipation scales, and so on. |