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On the performance of particle tracking

Published online by Cambridge University Press:  21 April 2006

Juan C. Agüí  and
J. Jiménez
Juan C. Agüí
Affiliation:
School of Aeronautics, Universidad Politécnica, 28040 Madrid, Spain
J. Jiménez
Affiliation:
IBM Scientific Centre, Paseo Castellana 4, 28046 Madrid, Spain and School of Aeronautics, Universidad Politécnica, 28040, Madrid, Spain
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Abstract

The sources of error associated with the use of particle-tracking techniques in the measurement of velocity and vorticity fields in moderately three-dimensional turbulent flows are analysed. The two dominant sources of error are the visualisation error, resulting from the limited resolution of the optical data acquisition system, and the sampling error, due to limited particle concentration. Their relative importance is discussed.

The performance of the interpolation methods used to translate the measurements from the positions of the particles to an arbitrary point is discussed, and a non-parametric algorithm is given to estimate the errors that arise, using only the available data. The smoothing of the results to produce flow maps of a given statistical significance is also discussed. Finally, the method is validated using simultaneous laser-Doppler velocity measurements.

The system is applied to measurements of the near wake of a circular cylinder. Velocity and vorticity maps are provided which throw light on the process by which the large eddies form and relax to their final equilibrium configurations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 185 , December 1987 , pp. 447 - 468
Copyright
© 1987 Cambridge University Press

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