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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.
- homogeous isotropic turbulence
- decaying turbulence
- evolved turbulence
- direct numerical simulation
Yoffe, S. R. & Linkmann, M. F., 21 Apr 2015, In : Physical Review E. 91, 4, 10 p., 043013.
Research output: Contribution to journal › ArticleOpen AccessFile19 Citations (Scopus)199 Downloads (Pure)
Self-organization and transition to turbulence in isotropic fluid motion driven by negative damping at low wavenumbersMcComb, W. D., Linkmann, M. F., Berera, A., Yoffe, S. R. & Jankauskas, B., 26 Jun 2015, In : Journal of Physics A: Mathematical and Theoretical. 48, 25, 7 p., 25FT01.
Research output: Contribution to journal › ArticleOpen AccessFile6 Citations (Scopus)128 Downloads (Pure)
Yoffe, S. R., Linkmann, M. F. & Berera, A., 20 Nov 2014, In : Physical Review E. 90, 5, 12 p., 053010.
Research output: Contribution to journal › ArticleOpen AccessFile13 Citations (Scopus)77 Downloads (Pure)