Abstract
Analysis of velocity traces obtained in the intermittent region of a wake by means of a rake of hot-wire probes has clearly shown that many of the weak fluctuations observed in the outer, very low-intermittency-factor region of the flow are associated with the turbulent bulges and are not potential flow fluctuations, as might be concluded from single probe measurements. Since most velocity-based conditional sampling techniques rely, to some extent, on a visual comparison of the intermittent signal and its indicator function, the choice of the threshold level associated with these techniques is rather subjective and, consequently, identification of these weak turbulent-zone fluctuations is often not made. A relatively objective and robust method of obtaining the threshold level for a velocity-based turbulent detector function is presented and discussed.
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