Article

Optical propagation through a homogeneous turbulent shear flow

02/1989;
Source: NTRS

ABSTRACT Effects of organized turbulent structures on the propagation of an optical beam in a homogeneous shear flow have been studied. A passive-scalar field in a computed turbulent shear flow is used to represent index-of-refraction fluctuations, and phase errors induced in a coherent optical beam by turbulent fluctuations are computed. The organized vortical structures produce a scalar distribution with elongated regions of intense fluctuations which have an inclination with respect to the mean flow similar to that of the characteristic hairpin eddies. It is found that rms phase error is minimized by propagating approximately normal to the inclined vortical structures. Two-point correlations of vorticity and scalar fluctuation suggest that the regions of intense scalar fluctuation are produced primarily by the hairpin eddies.

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Keywords

characteristic hairpin eddies
 
coherent optical beam
 
computed turbulent shear flow
 
hairpin eddies
 
homogeneous shear flow
 
inclined vortical structures
 
index-of-refraction fluctuations
 
intense fluctuations
 
intense scalar fluctuation
 
optical beam
 
organized vortical structures
 
passive-scalar field
 
phase errors induced
 
propagation
 
rms phase error
 
scalar distribution
 
scalar fluctuation
 
turbulent fluctuations
 
turbulent structures
 
Two-point correlations