Mesoscopic spectra in two-dimensional decaying turbulence

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Two-dimensional decaying turbulence is simulated using a lattice Boltzmann model with the Bhatnagar-Gross-Krook collision operator. Auto-power spectra, of the one-velocity particle distribution functions are presented. The relation between the spectrum of the kinetic energy and the spectra of the distribution functions is given. An interpretation of the non-equilibrium spectra as a measure of the dissipation in different scales is given. A peak in the spectrum of the resting particle distribution functions is observed exactly at the ultraviolet cutoff. It is shown that the peak can be associated with enhanced acoustic activity, which might be a numerical artifact or a consequence of the compressibility of the lattice Boltzmann fluid.

Original languageEnglish
Pages (from-to)531-543
Number of pages13
JournalInternational Journal of Modern Physics C
Volume17
Issue number4
Publication statusPublished - Apr 2006

Fingerprint

Distribution functions
Turbulence
turbulence
Distribution Function
distribution functions
Power spectrum
Compressibility
Kinetic energy
Lattice Boltzmann Model
Lattice Boltzmann
Acoustics
Gross
Power Spectrum
Ultraviolet
Non-equilibrium
compressibility
artifacts
power spectra
Dissipation
energy spectra

Keywords

  • Lattice Boltzmann method
  • Two-dimensional decaying turbulence

ASJC Scopus subject areas

  • Computer Science Applications
  • Computational Theory and Mathematics
  • Physics and Astronomy(all)
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Mesoscopic spectra in two-dimensional decaying turbulence. / Házi, G.

In: International Journal of Modern Physics C, Vol. 17, No. 4, 04.2006, p. 531-543.

Research output: Contribution to journalArticle

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