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Proceedings Paper

Turbulent mixing effects in models of thermal blooming
Author(s): David H. Chambers; James A. Viecelli; Thomas J. Karr
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Paper Abstract

A two-dimensional hydrodynamic model incorporating turbulent mixing is derived by averaging the three-dimensional hydrodynamics equations over slabs of thickness L in the direction of propagation. The resulting equations are identical with those for two-dimensional, incompressibl flow with additional terms representing the average effect of velocity fluctuations within each slab. These equations depend only parametrically on the coordinate in the direction of propagation. The extra terms have a simple physical interpretation but must be modeled in order to close the equations. Correlation times of scintillations are computed from a numerical simulation of plane-wave blooming using this model. A comparison with the correlation times from simulations with only wind shear indicate that the effect of turbulent mixing is relatively small for typical values of the Kolmogorov inner scale.

Paper Details

Date Published: 1 May 1990
PDF: 9 pages
Proc. SPIE 1221, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere, (1 May 1990); doi: 10.1117/12.18344
Show Author Affiliations
David H. Chambers, Lawrence Livermore National Lab. (United States)
James A. Viecelli, Lawrence Livermore National Lab. (United States)
Thomas J. Karr, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 1221:
Propagation of High-Energy Laser Beams Through the Earth's Atmosphere
Peter B. Ulrich; LeRoy E. Wilson, Editor(s)

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