Accession Number : ADA320777

Title :   Light Scattering Induced by Turbulent Flow: A Numerical Study.

Descriptive Note : Final technical rept. 1 Feb-31 Oct 96,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Domaradzki, J. A.

PDF Url : ADA320777

Report Date : JAN 1997

Pagination or Media Count : 65

Abstract : The direct numerical simulations of the temperature field in water were used to investigate light scattering caused by turbulent temperature inhomogeneities and to compare it with scattering caused by typical seawater particulates in two extreme cases: coastal and open ocean conditions. The particle contribution was simulated using Mie theory aided by theoretical considerations to describe scattering at small angles. Distributions of particles observed in an open ocean and a coastal environment were used. For the open ocean case study, we have assessed typical oceanic turbulence levels for the near-surface. We find that scattering due to simulated turbulence may dominate scattering due to particulates for small angles up to 10 degrees. In the coastal ocean case, simulated turbulence may dominate scattering up to 5 degrees. We have found that the scattering angle variance for a light beam propagating over O.25m pathlength in the oceanic water can be as large as 0.1 degrees.

Descriptors :   *LIGHT SCATTERING, *TURBULENCE, COMPUTERIZED SIMULATION, COASTAL REGIONS, OCEAN SURFACE, REFRACTIVE INDEX, TURBULENT FLOW, MIE SCATTERING, FLOW FIELDS, TEMPERATURE GRADIENTS, CASE STUDIES, LIGHT TRANSMISSION, PARTICULATES, NAVIER STOKES EQUATIONS, SEA WATER, HYDRODYNAMICS, REYNOLDS NUMBER, INCOMPRESSIBLE FLOW, OPEN WATER, PRANDTL NUMBER.

Subject Categories : Fluid Mechanics
      Optics
      Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE