Regeneration of Small Eddies by Data Assimilation in Turbulence | Zendy

Kyo Yoshida | Zendy; Junzo Yamaguchi | Zendy; Yukio Kaneda | Zendy

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Regeneration of Small Eddies by Data Assimilation in Turbulence

Author(s) -

Kyo Yoshida,

Junzo Yamaguchi,

Yukio Kaneda

Publication year - 2005

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.94.014501

Subject(s) - taylor microscale , eddy , turbulence , physics , dissipation , microscale chemistry , reynolds number , wavenumber , k omega turbulence model , scale (ratio) , turbulence modeling , mechanics , turbulence kinetic energy , thermodynamics , optics , mathematics , mathematics education , quantum mechanics

The effect of data assimilation of large-scale eddies on small-scale eddies in turbulence is studied by direct numerical simulations (DNSs) of Navier-Stokes turbulence with Taylor microscale Reynolds numbers up to 179. The DNSs show that even if the data of small-scale eddies are lost at some initial instant, they can be regenerated from the data of large-scale eddies under the condition that Fourier modes with wave number less than a critical wave number k(*) are continuously assimilated, where k(*) approximately 0.2eta(-1) with eta identical with(nu(3)/epsilon)(1/4), epsilon the mean energy dissipation rate, and nu the viscosity

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