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Numerical study of light scattering by a boundary-layer flow.

Darek J Bogucki1, Julian A Domaradzki

  • 1Rosenstiel School of Marine and Atmospheric Science, Division of Applied Marine Physics, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149-1098, USA. dbogucki@rsmas.miami.edu

Applied Optics
|September 10, 2005
PubMed
Summary

A developing laminar boundary layer on an optical window has a negligible effect on light scattering in free turbulence. This finding indicates that boundary layers do not hinder optical turbulence measurements.

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Light scattering on oceanic turbulence.

Applied optics·2004

Area of Science:

  • Fluid Dynamics
  • Optical Physics
  • Turbulence Research

Background:

  • Temperature inhomogeneities in free turbulence scatter light at near-forward angles.
  • Turbulent flow fields can be modified by the presence of rigid boundaries.

Purpose of the Study:

  • To numerically investigate how a rigid wall modifies free turbulence.
  • To assess the impact of these modifications on light propagation through turbulence.

Main Methods:

  • Simulating a 5 cm optical window in free turbulence at towing speeds of 0.1 and 1 m/s.
  • Analyzing the effect of a developing laminar boundary layer on temperature inhomogeneities (passive scalar, Pr=7).
  • Evaluating light scattering using the volume-scattering function (differential cross section).

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Main Results:

  • The developing laminar boundary layer showed a negligible effect on light scattering.
  • The volume-scattering function was not significantly altered by the boundary layer.
  • The boundary layer did not impede optical measurements of turbulence.

Conclusions:

  • Boundary layers developing on optical windows do not significantly affect light scattering in free turbulence.
  • Optical measurements of turbulence can be performed reliably even in the presence of such boundary layers.
  • The study confirms the robustness of optical techniques for turbulence characterization.