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Effects of organized turbulence structures on the phase distortion in a coherent optical beam propagating through a turbulent shear flowPhase distortion in a coherent optical beam propagating through a turbulent shear flow is studied. The instantaneous distribution of the index refraction is represented by a passive-scalar field in a computed homogeneous shear flow. The flow contains organized vortical structures (hairpin eddies), which are characteristic of turbulent shear flows. The phase distortion induced by turbulent fluctuations is calculated from the optical path difference through the flow. A conceptual model is proposed for the distribution of scalar fluctuations produced by the hairpin vortices in the shear flow. It is shown that the phase distortion of an optical beam can be minimized by propagating the beam at an angle approximately normal to the organized vortical structures in a turbulent shear flow.
Document ID
19900046163
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Truman, C. Randall
(New Mexico, University Albuquerque, United States)
Lee, Moon Joo
(NASA Ames Research Center Moffett Field; Stanford University, CA, United States)
Date Acquired
August 14, 2013
Publication Date
May 1, 1990
Publication Information
Publication: Physics of Fluids A
Volume: 2
ISSN: 0899-8213
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
90A33218
Funding Number(s)
PROJECT: AF PROJECT 2307Y1
Distribution Limits
Public
Copyright
Other

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