Stochastic subgrid model with scaling laws for oceanic simulations

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

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

Abstract

Stochastic and deterministic subgrid-scale parameterisations are developed for the large eddy simulation (LES) of oceanic flows. Parameterisations are developed for a flow representative of the Antarctic Circumpolar Current (ACC), generated using a spectral quasi-geostrophic code. The subgrid eddy viscosity coefficients are calculated using the approach of [3], whereby a high resolution reference direct numerical simulation (DNS) is truncated back to the LES truncation wavenumber TR. Two subgrid parameterisations are produced: isotropic, in which the coefficients are only dependent on the total wavenumber (n); and anisotropic, in which the coefficients are also dependent on zonal wavenumbers (m). These LES variants reproduce the kinetic energy spectra of the DNS at various resolutions. Scaling laws are determined representing the isotropic profiles, which make the parameterisations more generally applicable, as they remove the need for a higher resolution reference simulation.

Original languageEnglish
Title of host publicationProceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9780646583730
Publication statusPublished - 2012
Externally publishedYes
EventAustralasian Fluid Mechanics Conference 2012 - University of Tasmania (Newnham Campus), Launceston, Australia
Duration: 3 Dec 20127 Dec 2012
Conference number: 18th
http://www.18afmc.com.au/

Conference

ConferenceAustralasian Fluid Mechanics Conference 2012
Abbreviated titleAFMC 2012
CountryAustralia
CityLaunceston
Period3/12/127/12/12
OtherThe 18th AFMC is to be the 1st of a series which will be held every 2 years by The Australasian Fluid Mechanics Society.
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