DECAY OF ISOTROPIC TURBULENCE IN THE DIRECTINTERACTION APPROXIMATION,

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Abstract:

The direct-interaction equations for the decay of isotropic turbulence are integrated numerically with initial spectra of several shapes and initial Reynolds values of R less than or in the vicinity of 40. Results are presented for the evolution with time of total energy, dissipation, energy transfer, skewness factor, and other integral quantities, together with the associated wavenumber spectra. Similarity and self-preservation features of the evolving spectra are exhibited. The results are compared with grid-turbulence measurements by Stewart and Townsend. Results are also given for the timecorrelation of the total velocity at a fixed point in space and for the time-correlation and response functions of individual wavenumber modes. Author

Author(s):
Kraichnan, Robert H.
Author Organization(s):
NEW YORK UNIV N Y
Pagination:
0048

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
RR4
Contract/Grant Number(s):
Nonr3999 00
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6.3_Net Management; JCA_6_Net Centric
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
(*TURBULENCE, NUMERICAL METHODS AND PROCEDURES), TURBULENT BOUNDARY LAYER, TIME, ENERGY, EQUATIONS, STATISTICAL DISTRIBUTIONS, NUMERICAL ANALYSIS, VELOCITY, REDUCTION, INTERFERENCE, REYNOLDS NUMBER, STATISTICAL ANALYSIS
Report Date:
1963 Nov 01