Subgrid parameterisations for high resolution atmospheric flows

V. Kitsios, J. S. Frederiksen, Meelis Juma Zidikheri

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Abstract

Numerical and computational methods are developed for the Large Eddy Simulation of atmospheric ows on a sphere with a spectral quasi-geostrophic model. The subgrid scales of motion are parameterised us-ing a net eddy viscosity that is derived from a high resolution reference Direct Numerical Simulation with 504 zonal and total wavenumbers or 1536 × 768 grid points (longitude by latitude). Simulations are undertaken for a wide range of truncation wavenumbers to determine the influence of resolution on the net eddy viscosity. A universal scaling law for these coeffcients is established for application to large eddy simulations of more general geophysical flows.

Original languageEnglish
JournalANZIAM Journal
Volume52
Publication statusPublished - 2010
Externally publishedYes

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