Impact of resolution on stochastic subgrid parameterisations for atmospheric flows

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

Impact of resolution on stochastic subgrid parameterisations for atmospheric flows

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

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

Abstract

A stochastic spectral subgrid model for the Large Eddy Simulation (LES) of a quasi-geostrophic atmospheric flow is presented, with particular focus on the influence of resolution. The approach of Frederiksen & Kepert [3] is adopted, where the subgrid scales are represented by a drain-dissipation matrix plus a stochastic backscatter term. Two LES variants are presented: an anisotropic parameterisation, in which the subgrid model is dependent on the zonal and total wavenumbers; and an isotropic parameterisation only dependent on the total wavenumbers. The terms required for the subgrid parameterisations are determined from higher resolution Direct Numerical Simulations (DNSs). Two DNSs are presented, one with 126 zonal and total wavenumbers, and a second with 252 wavenumbers. The LES simulations have half the wavenumbers as compared to the respective DNS data sets. For both resolutions the LES variants agree with the kinetic energy spectra from the DNS very well. As the LES resolution increases the subgrid eddy viscosity and stochastic backscatter both decrease.

Original language	English
Title of host publication	17th Australasian Fluid Mechanics Conference 2010
Pages	799-802
Number of pages	4
Publication status	Published - 2010
Externally published	Yes
Event	Australasian Fluid Mechanics Conference 2010 - Auckland New Zealand, Auckland, New Zealand Duration: 5 Dec 2010 → 9 Dec 2010 Conference number: 17th http://afms.org.au/proceedings.html

Conference

Conference	Australasian Fluid Mechanics Conference 2010
Abbreviated title	AFMC 2010
Country/Territory	New Zealand
City	Auckland
Period	5/12/10 → 9/12/10
Other	The Australasian Fluid Mechanics Conference has grown steadily from its beginning at the University of Western Australia in 1962. The conference series has traditionally covered the broad field of fluid mechanics in all engineering and scientific disciplines. It provides a forum for presentation of papers in all aspects of fundamental and applied fluid mechanics. Proceedings of the 17th Australasian Fluid Mechanics Conference 5-9th December 2010 was edited by Prof. G.D. Mallinson and Dr J.E. Cater and published by the Faculty of Engineering in association with the Centre for Continuing Education The University of Auckland.
Internet address	http://afms.org.au/proceedings.html

Cite this

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title = "Impact of resolution on stochastic subgrid parameterisations for atmospheric flows",

abstract = "A stochastic spectral subgrid model for the Large Eddy Simulation (LES) of a quasi-geostrophic atmospheric flow is presented, with particular focus on the influence of resolution. The approach of Frederiksen \& Kepert [3] is adopted, where the subgrid scales are represented by a drain-dissipation matrix plus a stochastic backscatter term. Two LES variants are presented: an anisotropic parameterisation, in which the subgrid model is dependent on the zonal and total wavenumbers; and an isotropic parameterisation only dependent on the total wavenumbers. The terms required for the subgrid parameterisations are determined from higher resolution Direct Numerical Simulations (DNSs). Two DNSs are presented, one with 126 zonal and total wavenumbers, and a second with 252 wavenumbers. The LES simulations have half the wavenumbers as compared to the respective DNS data sets. For both resolutions the LES variants agree with the kinetic energy spectra from the DNS very well. As the LES resolution increases the subgrid eddy viscosity and stochastic backscatter both decrease.",

author = "V. Kitsios and Frederiksen, \{J. S.\} and Zidikheri, \{Meelis Juma\}",

year = "2010",

language = "English",

isbn = "9781617829130",

pages = "799--802",

booktitle = "17th Australasian Fluid Mechanics Conference 2010",

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TY - GEN

T1 - Impact of resolution on stochastic subgrid parameterisations for atmospheric flows

AU - Kitsios, V.

AU - Frederiksen, J. S.

AU - Zidikheri, Meelis Juma

N1 - Conference code: 17th

PY - 2010

Y1 - 2010

N2 - A stochastic spectral subgrid model for the Large Eddy Simulation (LES) of a quasi-geostrophic atmospheric flow is presented, with particular focus on the influence of resolution. The approach of Frederiksen & Kepert [3] is adopted, where the subgrid scales are represented by a drain-dissipation matrix plus a stochastic backscatter term. Two LES variants are presented: an anisotropic parameterisation, in which the subgrid model is dependent on the zonal and total wavenumbers; and an isotropic parameterisation only dependent on the total wavenumbers. The terms required for the subgrid parameterisations are determined from higher resolution Direct Numerical Simulations (DNSs). Two DNSs are presented, one with 126 zonal and total wavenumbers, and a second with 252 wavenumbers. The LES simulations have half the wavenumbers as compared to the respective DNS data sets. For both resolutions the LES variants agree with the kinetic energy spectra from the DNS very well. As the LES resolution increases the subgrid eddy viscosity and stochastic backscatter both decrease.

AB - A stochastic spectral subgrid model for the Large Eddy Simulation (LES) of a quasi-geostrophic atmospheric flow is presented, with particular focus on the influence of resolution. The approach of Frederiksen & Kepert [3] is adopted, where the subgrid scales are represented by a drain-dissipation matrix plus a stochastic backscatter term. Two LES variants are presented: an anisotropic parameterisation, in which the subgrid model is dependent on the zonal and total wavenumbers; and an isotropic parameterisation only dependent on the total wavenumbers. The terms required for the subgrid parameterisations are determined from higher resolution Direct Numerical Simulations (DNSs). Two DNSs are presented, one with 126 zonal and total wavenumbers, and a second with 252 wavenumbers. The LES simulations have half the wavenumbers as compared to the respective DNS data sets. For both resolutions the LES variants agree with the kinetic energy spectra from the DNS very well. As the LES resolution increases the subgrid eddy viscosity and stochastic backscatter both decrease.

UR - https://www.scopus.com/pages/publications/84857019149

M3 - Conference Paper

AN - SCOPUS:84857019149

SN - 9781617829130

SP - 799

EP - 802

BT - 17th Australasian Fluid Mechanics Conference 2010

T2 - Australasian Fluid Mechanics Conference 2010

Y2 - 5 December 2010 through 9 December 2010

ER -

Impact of resolution on stochastic subgrid parameterisations for atmospheric flows

Abstract

Conference

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