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Local modulated wave model for the reconstruction of space–time energy spectra in turbulent flows

  • Ting Wu (a1) and Guowei He (a1) (a2)


A statistical model is developed to reconstruct space–time energy spectra in turbulent flows from a non-extensive dataset comprising a time series of velocity fluctuations at a finite number of measurement points. This model is based on a higher approximation of energetic flow structures and developed by using local modulated waves. As a result, it can correctly predict the mean wavenumbers and spectral bandwidths. In contrast, Taylor’s frozen-flow hypothesis incorrectly predicts the spectral bandwidths to be zero, and the local wavenumber model significantly under-predicts the spectral bandwidths. An analytical example is formulated to illustrate the present model, and datasets from direct numerical simulations of turbulent channel flows are used to validate this model. The present statistical model is also discussed in terms of the dominating processes of temporal decorrelation in turbulent flows.


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Local modulated wave model for the reconstruction of space–time energy spectra in turbulent flows

  • Ting Wu (a1) and Guowei He (a1) (a2)


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