The passive scalar spectrum and the Obukhov-Corrsin constant

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It is pointed out that, for microscale Reynolds numbers less than about 1000, the passive scalar spectrum in turbulent shear flows is less steep than anticipated and that the Obukhov-Corrsin constant can be defined only if the microscale Reynolds number exceeds this value. In flows where the large-scale velocity field is essentially isotropic (as in grid turbulence), the expected 5/3 scaling is observed even at modest Reynolds numbers. All known data on the Obukhov-Corrsin constant are collected. The support for the notion of a "universal" constant is shown to be reasonable. Its value is about 0.4.

Original languageEnglish (US)
Pages (from-to)189-196
Number of pages8
JournalPhysics of Fluids
Issue number1
StatePublished - 1996

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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