Accession Number:

AD0686260

Title:

THE DISTORTION OF TURBULENCE BY IRROTATIONAL PLANE STRAIN,

Descriptive Note:

Corporate Author:

WINDSOR UNIV (ONTARIO) DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1967-12-08

Pagination or Media Count:

17.0

Abstract:

The experiments extend those of Townsend which form the basis of his model of free turbulence. Here straining is carried to a strain ratio of 61, while Townsends straining went only to 41. Two kinds of distorting ducts are used to produce the uniform mean strain applied to initially nearly isotropic grid turbulence. The results differ from Townsends in that 1 a considerably higher degree of anisotropy is achieved, Townsends measure of anisotropy attaining values up to 0.6, rather than the maximum of 0.42 he found 2 there is no evidence that an equilibrium structure is attained and 3 the strained turbulence rapidly becomes less anisotropic when the straining ceases. It is found to be possible to predict the variation of the total turbulence energy using rapid-distortion theory with a correction for decay. However, the individual components cannot be accurately predicted in this way. Author

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE