DECAY OF ISOTROPIC TURBULENCE IN THE DIRECTINTERACTION APPROXIMATION,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1963
- Accession Number
- AD0425830
Entities
People
- Robert H. Kraichnan
Organizations
- New York University