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The Determination of Velocity Spectra and Dissipation by Direct and Indirect Means using Second-Order Accurate PIV

by Edwub Cowen,
Quian Liao,



Document Type: Proceeding Paper

Part of: Hydraulic Measurements and Experimental Methods 2002

Abstract:

In this paper we present a 2 nd order accurate technique in space (following Wereley & Meinhart's (2001) extension of Cowen & Monismith's (1997) dynamic sub-window PIV algorithm) for the determination of the overlapping low and high wavenumber portions of velocity spectra by temporal and direct spatial means, respectively, and the determination of the in-plane components of the turbulent dissipation and mean squared fluctuating vorticity. The technique is based on the interrogation of a PIV image pair for the velocity at any arbitrary but exactly known point within the image pair. This avoids the need for interpolation of the velocity field to achieve either regularly sampled data for the determination of spectra or data spaced at particular length scales for the determination of the instantaneous fluctuating strain rates and vorticity.

Subject Headings: Wave velocity | Wave spectra | Turbulent flow | Strain rates | Strain | Energy dissipation | Arbitration

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