Open Access Repository

Looking for ‘‘laminars”: measuring intermittency on the America’s Cup race course


Downloads per month over past year

Binns, JR, Albina, FO and Burns, IA 2009 , 'Looking for ‘‘laminars”: measuring intermittency on the America’s Cup race course' , Experimental Thermal and Fluid Science, vol. 33, no. 5 , pp. 865-874 , doi: 10.1016/j.expthermflusci.2009.03.003.

BinnsAlbinaBurn...pdf | Download (2MB)
Available under University of Tasmania Standard License.


The determination of intermittency from experimental results has been achieved in the past by a number
of approximate methods, the most prolific of which involves the use of a detector function based on the
square of first and second derivatives of the flow velocity with respect to time. The disadvantages of such
methods are that they rely on appropriate time domain binning of the data, they are calibration dependent,
they involve error propagating numerical differentiation and 50% intermittency is incorrectly diagnosed
as an extremely high level of turbulence. Where experimental records are of limited time spans,
calibration is difficult, measurement errors are significant and a 50% intermittency measurement is
required for design purposes, the detector method loses its utility. However, recent experimental and
theoretical work by Ferchichi and Tavoularis [1] has revealed a remarkably Gaussian probability distribution
for the thermal passive scalar. The degree of self-similarity (analysed through the flatness of the signal)
can then be used as a measure of intermittency. Flatness analysis has been used in this study on full
scale data obtained experimentally on an International America’s Cup Class (IACC) yacht to overcome the
problems of intermittency measurement. A generalised signal conditioning technique has been proposed.

Item Type: Article
Authors/Creators:Binns, JR and Albina, FO and Burns, IA
Journal or Publication Title: Experimental Thermal and Fluid Science
ISSN: 0894-1777
DOI / ID Number: 10.1016/j.expthermflusci.2009.03.003
Additional Information:

The definitive version is available at

Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page