R. E. Kaplan


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.

Meeting Name

3rd Biennial Symposium on Turbulence in Liquids (1973: Sep., Rolla, MO)


Chemical and Biochemical Engineering


Much of the author's own research in this area has been supported by the National Science foundation under Grant GK-24578 and the Department of Transportation under Grant DOT-)S-00002.

Document Type

Article - Conference proceedings

Presentation Type

Invited Lecturer


Conditioned-Signal Analysis

Document Version

Final Version

File Type





© 1973 University of Missouri--Rolla, All rights reserved.