Turbulent mixing effects in models of thermal blooming

David H. Chambers; James A. Viecelli; Thomas J. Karr

doi:10.1117/12.18344

1 May 1990 Turbulent mixing effects in models of thermal blooming

David H. Chambers, James A. Viecelli, Thomas J. Karr

Proceedings Volume 1221, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere; (1990) https://doi.org/10.1117/12.18344
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

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.

Citation Download Citation

David H. Chambers, James A. Viecelli, and Thomas J. Karr "Turbulent mixing effects in models of thermal blooming", Proc. SPIE 1221, Propagation of High-Energy Laser Beams Through the Earth's Atmosphere, (1 May 1990); https://doi.org/10.1117/12.18344

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