Finite Mixture Model Applied in the Analysis of a Turbulent Bistable Flow on Two Parallel Circular Cylinders
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
A7-1 Mini Symposium on Flow-induced Vibration in Nuclear Components

Alexandre De Paula (UFRGS - Federal University of Rio Grande do Sul)
Sergio Möller (Federal University of Rio Grande do Sul)


This paper presents a study of the bistable phenomenon which occurs in


the turbulent flow

impinging on circular cylinders placed side-by-side. Time series of axial and transversal velocity


obtained with the constant temperature hot wire anemometry technique in an aerodynamic


channel are used as input data in a finite mixture model, to classify the observed data according


to a family of probability density functions. Wavelet transforms are applied to analyze the


unsteady turbulent signals. Results of flow visualization show a predominantly two-dimensional


behavior. A double-well energy model is suggested to describe the behavior of the bistable


phenomenon in this case.



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