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- W2017807384 abstract "We study turbulence undergoing rapid rotation. We show that there exist two different regimes divided by the new number N=K/νΩ. N<1: rotation is so strong that it suppresses the energy cascade process and no inertial regime can develop. In the freely decaying case, only viscosity operates: an initially isotropic three-dimensional (3-D) turbulence remains so and never tends toward a 2-D state. N>1: the energy cascade, though inhibited, allows an inertial regime in which 3-D and a quasi-2-D state exist in equilibrium. The latter is restricted to a narrow band of values δkz∼kΩ−1k2, where kΩ=(Ω3ε−1)1/2. For k>kΩ, the Kolmogorov spectrum sets in, while for k<kΩ, the spectrum exhibits a new form, E(k)∼(εΩ)1/2k−2. A freely decaying turbulence within a time scale τΩ∼(Ωε−1)1/2L tends to a 2-D–3-D regime: K∼t−n while horizontal length scales grow as tm, where (m,n) are half the values of the Ω=0 case. As for the vertical length scales, one grows as the horizontal scales, while the other grows much faster, demonstrating the existence of the 2-D mode. The nonlinear interactions, though weakened, are the main cause of two-dimensionalization, which, however, is not of the Proudman–Taylor type since the latter requires negligible nonlinearities. We also derive the dynamic equation for the dissipation rate ε. All the results are shown to be in agreement with numerical simulation and experimental data." @default.
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- W2017807384 title "A dynamical model for turbulence. V. The effect of rotation" @default.
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- W2017807384 doi "https://doi.org/10.1063/1.869332" @default.
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