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The concepts of fractal geometry can be related to the study of the dispersion of passive tracers in a turbulent flow field. Some basic methods have been applied in order to determine the fractal characteristics of the highly convoluted shape of the spatial instantaneous distribution of the passive tracer. The first approach employs a fractal Brownian model and explains how this model can be used, in combination with measurements taken by visualisation of cross- sections at a given instant of the flowfield. The results from the original hypothesis were not convincing and an extension of the original approach towards the notion of multifractal measures has been attempted. The aim is to set up the cascade model, and hence to derive information on the possible underlying multiplicative process that gives rise to it. The direct determination method for computing the singularity spectrum has been applied for one and two dimensional cuts of digitised images of the flowfield.

Additional information

Authors: OLIVARI D, Von Karman Institute for Fluid Dynamics, Rhode Saint Genèse (BE);DIPLA A,
Bibliographic Reference: Paper presented: ICHMT - Spatio-Temporal Structure and Chaos in Heat and Mass Transfer Processes, Atene (IT), May 21-23, 1992
Availability: Available from (1) as Paper EN 36813 ORA
Record Number: 199211531 / Last updated on: 1994-11-29
Original language: en
Available languages: en