Variations of characteristic time scales in rotating stratified turbulence using a large parametric numerical study

摘要: We study rotating stratified turbulence (RST) making use of numerical data stemming from a large parametric varying the Reynolds, Froude and Rossby numbers, Re, Fr Ro in broad range values. The computations are performed using periodic boundary conditions on grids 10243 points, with no modeling small scales, forcing large-scale random initial for velocity field only, there altogether 65 runs analyzed this paper. buoyancy Reynolds number defined as R B = ReFr 2 varies negligible values to $ \approx$ 105, approaching atmospheric or oceanic regimes. This preliminary analysis deals variation characteristic time scales RST dimensionless parameters, focusing role played by partition energy between kinetic potential modes, key ingredient dynamics such flows. find that neither rotation nor ratio Brunt-Vaisala frequency inertial seem play major absence global small-scale modes. Specifically, these computations, mostly regimes wave turbulence, times based dissipation temperature fluctuations, TV TP, vary substantially parameters. Their \gamma T_{V}/T_{P}$ follows roughly bell-shaped curve terms Richardson Ri. It reaches plateau --on which become comparable, \approx 0.6$ -- when has significantly strengthened, leading numerous destabilization events together tendency towards an isotropization flow.