Results 181 to 190 of about 31,732 (215)
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Anisotropic non-Kolmogorov turbulence phase screens with variable orientation
Applied Optics, 2015We describe a modification to fast Fourier transform (FFT)-based, subharmonic, phase screen generation techniques that accounts for non-Kolmogorov and anisotropic turbulence. Our model also allows for the angle of anisotropy to vary in the plane orthogonal to the direction of propagation. In addition, turbulence strength in our model is specified via a
Jeremy P, Bos +2 more
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Multicomponent turbulence, the spherical limit, and non-Kolmogorov spectra
Physical Review E, 1995A set of models for homogeneous, isotropic turbulence is considered in which the Navier-Stokes equations for incompressible fluid flow are generalized to a set of N coupled equations in N velocity fields. It is argued that in order to be useful these models must embody a new group of symmetries, and a general formalism is laid out for their ...
, Mou, , Weichman
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Annular beam scintillations in non-Kolmogorov weak turbulence
Applied Physics B, 2012In a weakly turbulent atmosphere governed by the non-Kolmogorov spectrum, the on-axis scintillation index is formulated and evaluated when the incidence is an annular Gaussian type. When the power law of the non-Kolmogorov spectrum is varied, the scintillation index first increases, and reaches a peak value, then starts to decrease, and eventually ...
H. Gerçekcioğlu, Y. Baykal
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Non-Kolmogorov dissipation in a turbulent planar jet
Physical Review Fluids, 2018Adopting Lie symmetry group theory both Kolmogorov and non-Kolmogorov scaling and dissipation laws are explored theoretically for a turbulent planar jet. We find that the jet entrainment coefficient varies with streamwise distance when non-Kolmogorov scaling laws hold.
G. C. Layek, null Sunita
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A General Mathematical Model For Non-Kolmogorov Turbulence
Imaging and Applied Optics, 2013We present a power spectral density model of index of refraction, including power law relations within finite bands, and impulses denoting energy concentrations. We then discuss some resulting equations, without resorting to Kolmogorov assumptions.
Thomas C Farrell +3 more
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Propagation characteristics of decentered annular beams through non-Kolmogorov turbulence
Journal of the Optical Society of America A, 2013This paper studies the propagation characteristics related to higher-order moments of decentered annular beams through non-Kolmogorov turbulence. The analytical expressions for the mean-squared beam width w, the skewness parameter A, and the kurtosis parameter K are derived.
Xiaoqing, Li, Xiaoling, Ji
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Adaptive-optics compensation by distributed beacons for non-Kolmogorov turbulence
Applied Optics, 2001In optical propagation through atmospheric turbulence, the performance of compensation with adaptive optics depends on a beacon's spatial distribution. With distributed beacons, the inefficiency of the modal correction, which is defined as the ratio of the anisoplanatic error of the jth mode and the Zernike-coefficient variance, is derived by use of ...
C, Rao, W, Jiang, N, Ling
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Limits on wave optics simulations in non-Kolmogorov turbulence
Laser Communication and Propagation through the Atmosphere and Oceans VII, 2018Wave Optics Simulations (WOS) are a valuable tool for exploring the effects of atmospheric turbulence on laser beam propagation and imaging. Obtaining accurate results from WOS requires careful selection of simulation parameters. Specifically, the inter-screen spacing, spatial sampling of source and receiver planes, and phase screen sampling are all ...
Stephen J. Grulke, Jeremy P. Bos
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LIDAR systems operating in a non-Kolmogorov turbulent atmosphere
Waves in Random and Complex Media, 2018ABSTRACTIt is well known that in free atmosphere the Kolmogorov power spectrum of the refractive index might not properly describe the actual turbulence behavior.
I. Toselli, F. Wang, O. Korotkova
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