Published January 1, 2007
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Contribution of Coherent and Incoherent Vorticity Fields to High Reynolds Number Homogeneous Isotropic Turbulence : a Wavelet Viewpoint
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Summary. A wavelet-based method to extract coherent vortices is applied to data obtained by direct numerical simulations of three-dimensional incompressible homogeneous isotropic turbulence for di3erent Taylor microscale Reynolds numbers, ranging from $R$ = 167 to 732. We find that the coherent vortices well preserve statistics of the total flow. The incoherent flow is structureless and noise like. The percentage of wavelet coe3cients representing the coherent vortices decreases as the Reynolds number increases.
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