Large-Eddy Simulation of Decaying Stably Stratified Turbulence

摘要: Abstract A large-eddy simulation (LES) model is developed and employed to study the interactions among turbulent internal gravity wave motions in a uniformly stratified fluid at oceanic space time scales. The decay of random initial energy spectrum simulated triply periodic domain (L=10 m) by solving full nonlinear, three-dimensional Navier-Stokes equations using pseudospectral techniques numerical resolution 643 modes. subgrid scale (SGS) fluxes are parameterized Smargorinsky SGS flux parameterization. Three experiments were performed with mean buoyancy frequencies (N) 1, 3, 10 cph for period times (Nt). temporal evolution domain-averaged statistics used examine nature decaying turbulence. Initially (0≤Nt≤2), levels rapidly as spectral distributions evolve toward more isotropic forms. During this time, (BF) remains negative indicating conversion kinetic to...