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- W2057173694 abstract "A new statistical two-point closure EDQNM (Eddy Damped Quasi Normal Markovian) model for axisymmetric stratified turbulence is presented. This model takes into account the detailed anisotropic structure of the flow, including angular dependence, and its closure assumption may involve explicit effects of the stratification. In the present paper, a simplified closure assumption is used, in which these explicit effects are not taken into account. The model is tested against three-dimensional direct numerical simulations (DNS) of decaying homogeneous stratified turbulence. A very good agreement is found between DNS results and EDQNM predictions, when energy transfers between the different modes of motion are considered. However, transfers among wavenumbers are insufficiently damped by the EDQNM model, because of the simplified closure assumption, thus yielding a somewhat less satisfactory agreement. An interesting prediction of the EDQNM model is the existence of a ‘directional’ anisotropy at all scales of motion, to the smallest: the level of the total (kinetic + potential) energy density spectrum E(k,θk) varies with the angle θk that the wavenumber vector k makes with the vertical." @default.
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- W2057173694 date "1996-01-01" @default.
- W2057173694 modified "2023-09-25" @default.
- W2057173694 title "Decaying stratified turbulence: comparison between a two-point closure EDQNM model and direct numerical simulations" @default.
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- W2057173694 doi "https://doi.org/10.1016/0377-0265(95)00411-4" @default.
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