Kolmogorov constants for the second-order structure function and the energy spectrum

Rui Ni, Ke Qing Xia

    Research output: Contribution to journalArticlepeer-review

    15 Scopus citations

    Abstract

    We examine the behavior of the Kolmogorov constants C2, C k, and Ck1, which are, respectively, the prefactors of the second-order longitudinal structure function and the three-dimensional and one-dimensional longitudinal energy spectrum in the inertial range. We show that their ratios, C2/Ck1 and Ck/Ck1, exhibit clear dependence on the microscale Reynolds number Rλ, implying that they cannot all be independent of Rλ. In particular, it is found that (Ck1/C2-0.25)=1.95Rλ- 0.68. The study further reveals that the widely used relation C 2=4.02Ck1 holds only asymptotically when R λâ‰3105. It is also found that C2 has much stronger Rλ dependence than either Ck or Ck1 if the latter indeed has a systematic dependence on R λ. We further show that the varying dependence on R λ of these three numbers can be attributed to the difference of the inertial range in real- and wave-number space, with the inertial range in real-space known to be much shorter than that in wave-number space.

    Original languageEnglish (US)
    Article number023002
    JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
    Volume87
    Issue number2
    DOIs
    StatePublished - Feb 5 2013

    All Science Journal Classification (ASJC) codes

    • Statistical and Nonlinear Physics
    • Statistics and Probability
    • Condensed Matter Physics

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