The concept of organized, spatially coherent large scale structures has been investigated for a variety of turbulent shear flows by a technique called "Conditional Sampling." It can be shown that these structures are related to physically important activities such as, 1) the entrainment of turbulent boundary layers, and 2) the maintenance of turbulence by a wall, 3) the growth of free shear layers, and 4) the structure and noise production of turbulent jets.
The general technique of conditioned sampling is related to visualizations of the flow, and to problems of synchronization of images in the presence of noise. While there are too many different techniques of conditional sampling to include in a short review, several of the important results of various techniques are compared to other visualizations of the flow and are shown to provide more useful quantitative insights into the structure of the turbulence.
Kaplan, R. E., "Conditioned Sampling Techniques" (1973). Symposia on Turbulence in Liquids. 118.
3rd Biennial Symposium on Turbulence in Liquids (1973: Sep., Rolla, MO)
Chemical and Biochemical Engineering
Article - Conference proceedings
© 1973 University of Missouri--Rolla, All rights reserved.