A method is introduced of educing coherent eddy structures from turbulent flows and quantifying the variation of the structures found. The method has been applied to conditionally sampled flow fields associated with ejection events in a numerical simulation of a turbulent boundary layer at very low Reynolds number. It is found that asymmetric streamwise vortical structures, reminiscent of those seen in smoke visualizations, are consistently associated with the ejection events. The size of these organized eddies is related loosely to the position of the ejection.
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This work was carried out under an ERCOFTAC collaborative project between the Swiss Federal Institute of Technology, Lausanne (EPFL), Queen Mary and Westfield College, University of London, and the University of Surrey, England. I am grateful for the support of the ERCOFTAC pilot centre at EPFL and to the Service Informatique Central of EPFL for computer resources, and for leave of absence from QMW and the University of Surrey to pursue this research.
Communicated by Mark N. Glauser, Jean-Paul Bonnet, and Thomas B. Gatski
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Voke, P.R. Affine matching pattern-recognition analysis of eddy structures in a numerically simulated boundary layer. Theoret. Comput. Fluid Dynamics 5, 141–152 (1993). https://doi.org/10.1007/BF00271655
- Boundary Layer
- Reynolds Number
- Flow Field
- Mathematical Method