Onset criteria for freely decaying isotropic turbulence

Yoffe, S. R. and McComb, W. D. (2018) Onset criteria for freely decaying isotropic turbulence. Physical Review Fluids, 3. 104605. ISSN 2469-990X (https://doi.org/10.1103/PhysRevFluids.3.104605)

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Abstract

From direct numerical simulation (DNS) of turbulence decaying from specified initial conditions for the range of initial Taylor-Reynolds numbers 2.58 ≤ Rλ(0) ≤ 358.6, it was found that the shape of the iconic curve of dimensionless dissipation versus Reynolds number depended strongly on the choice of measurement time. For our preferred time, a composite based on peak values in the dissipation and inertial transfer curves, the result was virtually identical to the forced, stationary case. In order to try varying the initial conditions, an additional run was performed, using the data from a stationary, forced simulation with Rλ = 335 for the initial condition. The results of this suggested that the time taken for energy to pass through the cascade was about one half of an initial eddy turnover time. In the course of studying onset criteria, we found that the exponent for the power-law decay of the energy decreased with increasing Reynolds number and lay in the range 1.35 ≤ n ≤ 2.60.

ORCID iDs

Yoffe, S. R. ORCID logoORCID: https://orcid.org/0000-0002-6723-4990 and McComb, W. D.;
  • Item type:Article
    ID code:65508
    Dates:
    Date
    Event
    15 October 2018
    Published
    18 September 2018
    Accepted
    18 May 2018
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:20 Sep 2018 12:49
    Last modified:11 Nov 2024 12:03
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/65508
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