Abstract
A spectral decomposition method is proposed to segregate the contributions of wall-attached/wall-detached and self-similar/non-self-similar eddies by taking advantage of the proper orthogonal decomposition. It is applied to analyze the compressible and incompressible turbulent channel flows to verify the Reynolds number and compressibility effects on velocity fluctuations and investigate whether the temperature fluctuations share similar features. The statistical properties of eddies of each category have been discussed in detail.
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