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Aero-Optical Wavefronts and Scale-Local Charcterization in Large-Reynolds-Number Compressible Turbulence.

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Title: Aero-Optical Wavefronts and Scale-Local Charcterization in Large-Reynolds-Number Compressible Turbulence.
Authors: Aguirre, Roberto C.1, Catrakis, Haris J.1 catrakis@uci.edu, Atassi, H.
Source: AIAA Journal. Oct2004, Vol. 42 Issue 10, p1982-1990. 9p. 8 Diagrams.
Subjects: Aerodynamics, Fluid dynamics, Turbulence, Mechanical engineering, Mechanical movements, Holography, Optics
Abstract: A new technique is proposed that enables the scale-local characterization of aero-optical wavefronts. Because optical wavefronts degraded by turbulent flows are physically highly anisotropic and exhibit distortions over a wide range of scales, a method is needed to examine the wavefront structure at varying degrees of anisotropy and as a function of scale. We introduce an aero-optical-wavefront-anisotropy (AWA) parameter as the ratio of scaling factors for the wavefront distortions and for the wavefront transverse extent. This AWA parameter, combined with box counting, enables a scale-local anisotropic examination of the wavefronts. We demonstrate this technique on wavefronts derived from experiments on large-Reynolds-number (Re ∼ 106) high-compressibility (Mc ∼ 1) turbulent shear layers between dissimilar-index-of-refraction gases. Variation of the AWA parameter and scale-local examination of the distortions reveal the presence of anisotropic self-similarity, or self-affinity, at small scales spanning nearly a decade. This finding shows the utility of the technique to detect scaling in large-Reynolds-number flow experiments from the aero-optical behavior. The present finding and technique provide key ingredients to extrapolate the small-scale properties of compressible-flow aero-optical wavefronts to higher Reynolds numbers and are also useful for modeling and for computational aero-optics. [ABSTRACT FROM AUTHOR]
Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 14795172
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PubType: Academic Journal
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  Data: A new technique is proposed that enables the scale-local characterization of aero-optical wavefronts. Because optical wavefronts degraded by turbulent flows are physically highly anisotropic and exhibit distortions over a wide range of scales, a method is needed to examine the wavefront structure at varying degrees of anisotropy and as a function of scale. We introduce an aero-optical-wavefront-anisotropy (AWA) parameter as the ratio of scaling factors for the wavefront distortions and for the wavefront transverse extent. This AWA parameter, combined with box counting, enables a scale-local anisotropic examination of the wavefronts. We demonstrate this technique on wavefronts derived from experiments on large-Reynolds-number (Re ∼ 106) high-compressibility (Mc ∼ 1) turbulent shear layers between dissimilar-index-of-refraction gases. Variation of the AWA parameter and scale-local examination of the distortions reveal the presence of anisotropic self-similarity, or self-affinity, at small scales spanning nearly a decade. This finding shows the utility of the technique to detect scaling in large-Reynolds-number flow experiments from the aero-optical behavior. The present finding and technique provide key ingredients to extrapolate the small-scale properties of compressible-flow aero-optical wavefronts to higher Reynolds numbers and are also useful for modeling and for computational aero-optics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Optics
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              Text: Oct2004
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