Measurement of Turbulent Spatial Structure and Kinetic Energy Spectrum—Part 1: Convection Record Method

  • Preben BuchhaveEmail author
  • Clara M. Velte
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 196)


A novel exact temporal to spatial mapping for point measurements in turbulence has been developed. The spatial record is obtained based on the instantaneous velocity magnitude, \(u=|\mathbf {u}|\), creating an exact mapping between the sampling interval, \(\varDelta t\), and the spatial record counterpart, \(\varDelta s\), through the relation \(\varDelta s_n = u_n \varDelta t_n\). n indicates the sample number in a measurement sequence. Summation of the consecutive streakline elements, \(\varDelta s\), corresponding to the convection distance of the fluid, results in a spatial “convection record”. The exact mapping applies to all flows, since it is based on the instantaneous velocity magnitude, thereby incorporating all relevant aspects of the flow dynamics. Even high intensity non-equilibrium spatial records can be measured using this mapping, which is most straightforwardly applied using laser Doppler anemometry measurements. Computer simulated high intensity LDA data demonstrate the technique. The method will also be demonstrated on measurements in a round turbulent jet in part 2.


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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Intarsia OpticsBirkerødDenmark
  2. 2.Technical University of DenmarkKgs. LyngbyDenmark

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