Abstract
Enhanced Variable Interval Time Averaging (EVITA) is introduced as a method that incorporates structure information directly into the detection method. The paper tests VITA and EVITA against an ersatz turbulence signal (antisymmetric exponential time decay) inserted into a random noise distribution. It is shown that EVITA is much less dependent than VITA on the choice of both threshold level and averaging time. EVITA is then applied to particle image velocimetry turbulence data from channel flow [7] at Re = 2872, and is shown to effectively extract bursting events.
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This work forms part of the Ph.D. thesis of P. Sullivan
The authors gratefully acknowledge Dr. R.J. Adrian for providing the channel data. The work is supported by Natural Science and Engineering Research Council of Canada, Queen's University Advisory Research Council and DANTEC, New Jersey. MD was supported through two NSERC summer undergraduate fellowships.
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Sullivan, P., Day, M. & Pollard, A. Enhanced VITA technique for turbulent structure identification. Experiments in Fluids 18, 10–16 (1994). https://doi.org/10.1007/BF00209356
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DOI: https://doi.org/10.1007/BF00209356