A large eddy simulation turbulence model and a local filtering assimilation method for ocean circulation problems

ZHAN Jie-min; YAN Xiao-hai

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ZHAN Jie-min, YAN Xiao-hai. A large eddy simulation turbulence model and a local filtering assimilation method for ocean circulation problems[J]. Haiyang Xuebao, 2004, 26(3): 8-15.

Citation:

ZHAN Jie-min, YAN Xiao-hai. A large eddy simulation turbulence model and a local filtering assimilation method for ocean circulation problems[J]. Haiyang Xuebao, 2004, 26(3): 8-15.

ZHAN Jie-min, YAN Xiao-hai. A large eddy simulation turbulence model and a local filtering assimilation method for ocean circulation problems[J]. Haiyang Xuebao, 2004, 26(3): 8-15.

Citation:

ZHAN Jie-min, YAN Xiao-hai. A large eddy simulation turbulence model and a local filtering assimilation method for ocean circulation problems[J]. Haiyang Xuebao, 2004, 26(3): 8-15.

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A large eddy simulation turbulence model and a local filtering assimilation method for ocean circulation problems

Received Date: 2003-03-02
Rev Recd Date: 2004-02-25

Abstract

Abstract

A local spectral filtering expansion method is proposed,which is a data assimilation method.Using this method,the high frequency waves in computation and measurement can be filtered.TOPEX/Poseidon altimetric sea surface height(SSH) data are assimilated into a large eddy simulation model to drive the circulation of the tropical and north Pacific Ocean.With data assimilation,the root mean square method is used to estimate optimizing data between the simulated SSH field and the observed SSH field.In large scale motions of circulations in coastal seas and shallow-water problems,different characteristics of flow on the horizontal plane and in the vertical direction are expected.A new large eddy simulation model(LES) is proposed.There are some differences between the present method and the other LES models.The philosophy of the large eddy simulation and the directional eddy viscosity method are applied to the horizontal plane and to the vertical direction,respectively.Comparing with the other LES models in which there is no difference between horizontal viscosity and vertical viscosity,the proposed method is more reasonable.Numerical results agree very well with the observed results.
- large eddy simulation,
- local spectral filtering expansion method,
- F DM,
- ocean circulation

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References(22)

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