Abstract
A statistical two-point closure — the Eddy Damped Quasi Normal Markovian (EDQNM) — approximation is used to model the sub-grid scales (SGS) in a large-eddy simulation (LES) of three-dimensional homogeneous turbulence. First, eddy viscosities and diffusivities are derived from the hypothesis of a k −5/3 energy spectrum to parameterize the small scales of velocity and passive scalar fields: in that case, the LES yields fairly good k −5/3 inertial spectra up to the cutoff wavenumber. Then, a complete coupling between the LES in the large scales and the EDQNM calculation of the small scales is developed. Finally, the numerical simulation of large eddies is assessed from the standpoint of predictability studies.
The National Center for Atmospheric Research is sponsored by the National Science Foundation
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Chollet, J.P. (1985). Two-Point Closure Used for a Sub-Grid Scale Model in Large Eddy Simulations. In: Bradbury, L.J.S., Durst, F., Launder, B.E., Schmidt, F.W., Whitelaw, J.H. (eds) Turbulent Shear Flows 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69996-2_5
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DOI: https://doi.org/10.1007/978-3-642-69996-2_5
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