Abstract
The cross-correlations of near- and far-field pressure in a M=0.6 cold jet are oscillatory, which implies some phaselocking. A simple model and synthetic signals show that the locking may be related to the steep attenuation with distance from the near-field sensors. In the near-field, wavelet-based nonlinear filtering separates fluctuations that are recognizable at x/D = 3 and 6 ('matched') from the others ('residue'). This decomposition yields distinct signatures in the crosscorrelations. The corresponding time lags and frequencies in the cross-correlations point to several categories of sources and their locations. The interpretation is consistent with the eddy pairing or breakdown (i.e. loss of identity) as the sources of noise for short lags, but the longer time lags require another explanation.
Original language | English (US) |
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State | Published - 2011 |
Event | 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada Duration: Jul 28 2011 → Jul 31 2011 |
Other
Other | 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 |
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Country/Territory | Canada |
City | Ottawa |
Period | 7/28/11 → 7/31/11 |
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes