期刊
PHYSICS OF FLUIDS
卷 23, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3589345
关键词
amplitude modulation; boundary layer turbulence; compressible flow; flow measurement; flow simulation; Hilbert transforms; numerical analysis
The amplitude modulation (AM) imparted by the outer layer large-scale motions on the near-wall turbulence is studied through direct numerical simulation of compressible boundary layer flow at moderate Reynolds number. Mathis et al. [J. Fluid Mech. 628, 311 (2009)] introduced an amplitude modulation coefficient to quantify this effect, whereby carrier and modulated signals are decoupled through a procedure based on the Hilbert transform of the streamwise velocity signals. However, Schlatter and Orlu [Phys. Fluids 22, 051704 (2010)] have recently shown that a non-zero amplitude modulation coefficient is closely associated to a non-zero value of the velocity skewness, and therefore, it does not necessarily reflect genuine physics. In this paper, the analysis is extended through systematic use of the two-point amplitude modulation correlation, which is shown to be a refined measure of the top-down influence of large-scale outer events on the inner part of the boundary layer. (C) 2011 American Institute of Physics. [doi:10.1063/1.3589345]
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