Scaling of the maximum-entropy turbulence energy spectra

Research output: Contribution to journalArticlepeer-review

Abstract

The log-normal type of turbulence energy spectral function, derived from the maximum entropy principle, is shown to be parameterizable in terms of root turbulence variables including the Reynolds number. The spectral function is first compared with a number of experimental data sets, showing a very close agreement across the entire energy and length (wavenumber) scales. The peak wavenumber (m) and the width parameter (C2) prescribe the spectral location and broadening, respectively, when the Reynolds number increases, where C2 has ∼1/Rem dependence. The energy scale is adjusted with a multiplicative factor. In this perspective, the inertial scaling from k−3 to k−5/3 when the flow transitions from two- to three-dimensions is explained as the increase in spectral width since the range of scales varies as Re1∕2 and Re3/4 for two and three-dimensional turbulence, respectively. Energy spectra at various locations in channel flows are also reproduced using the same function, indicating applicability wherever local equilibrium is achieved. Therefore, based on a small number of scaling parameters the full energy spectra can be prescribed using the maximum-entropy formalism.

Original languageEnglish (US)
Pages (from-to)128-134
Number of pages7
JournalEuropean Journal of Mechanics, B/Fluids
Volume87
DOIs
StatePublished - May 1 2021

Keywords

  • Energy spectra
  • Maximum entropy
  • Scaling
  • Turbulence

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)

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