Some results on the Reynolds number scaling of pressure statistics in isotropic turbulence

D. A. Donzis, K. R. Sreenivasan, P. K. Yeung

Research output: Contribution to journalArticle

Abstract

Using data from direct numerical simulations in the Reynolds number range 8≤≤1000, where is the Taylor microscale Reynolds number, we assess the Reynolds number scaling of the microscale and the integral length scale of pressure fluctuations in homogeneous and isotropic turbulence. The root-mean-square (rms) pressure (in kinematic units) is about 0.91ρu′2, where u′ is the rms velocity in any one direction. The ratio of the pressure microscale to the (longitudinal) velocity Taylor microscale is a constant of about 0.74 for very low Reynolds numbers but increases approximately as 0.17Rλ13 at high Reynolds numbers. We discuss these results in the context of the existing theory and provide plausible explanations, based on intermittency, for their observed trends.

Original languageEnglish (US)
Pages (from-to)164-168
Number of pages5
JournalPhysica D: Nonlinear Phenomena
Volume241
Issue number3
DOIs
StatePublished - Feb 1 2012

Keywords

  • Numerical simulations
  • Pressure fluctuations
  • Turbulence

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Applied Mathematics

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