Space-Time Correlations and Dynamic Coupling in Turbulent Flows
نویسندگان
چکیده
منابع مشابه
Space-time correlations of fluctuating velocities in turbulent shear flows.
Space-time correlations or Eulerian two-point two-time correlations of fluctuating velocities are analytically and numerically investigated in turbulent shear flows. An elliptic model for the space-time correlations in the inertial range is developed from the similarity assumptions on the isocorrelation contours: they share a uniform preference direction and a constant aspect ratio. The similar...
متن کاملElliptic model for space-time correlations in turbulent shear flows.
An elliptic model for space-time correlations in turbulent shear flows is proposed based on a second order approximation to the iso-correlation contours, while Taylor's hypothesis implies a first-order approximation. It is shown that the space-time correlations are mainly determined by their space correlations and the convection and sweeping velocities. This model accommodates two extreme cases...
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We investigate spatial and temporal cross-correlations between streamwise and normal velocity components in three shear flows: a low-dimensional model for vortex-streak interactions, direct numerical simulations for a nearly homogeneous shear flow and experimental data for a turbulent boundary layer. A driving of streamwise streaks by streamwise vortices gives rise to a temporal asymmetry in th...
متن کاملTime Correlations and the Frequency Spectrum of Sound Radiated by Turbulent Flows
Theories of turbulent time correlations are applied to compute frequency spectra of sound radiated by isotropic turbulence and by turbulent shear ows. The hypothesis that Eulerian time correlations are dominated by the sweeping action of the most energetic scales implies that the frequency spectrum of the sound radiated by isotropic turbulence scales as ! for low frequencies and as ! 4=3 for hi...
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\The low frequency sound from multipole sources in axisymmetric shear ows, with applications to jet noise," J. ow with a uniform mean temperature gradient," J. \On the two components of turbulent mixing noise from supersonic jets," AIAA paper 96
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ژورنال
عنوان ژورنال: Annual Review of Fluid Mechanics
سال: 2017
ISSN: 0066-4189,1545-4479
DOI: 10.1146/annurev-fluid-010816-060309