Intense Reynolds-stress events in turbulent ducts
International Journal of Heat and Fluid Flow, 2021 Abstract The aim of the present work is to investigate the role of intense Reynolds shear-stress events in the generation of the secondary flow in turbulent ducts. We consider the connected regions of flow where the product of the instantaneous fluctuations of two velocity components is higher than a threshold based on the long-time turbulence ...
Atzori M. +3 more
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Free-space optical communication employing subcarrier modulation and spatial diversity in atmospheric turbulence channel [PDF]
, 2008 An expression for the bit error rate of a multiple subcarrier intensity-modulated atmospheric optical communication system employing spatial diversity is derived. Spatial diversity is used to mitigate scintillation caused by atmospheric turbulence, which
Ghassemlooy, Zabih +9 more
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Coherent polarization shift keying modulated free space optical links over a Gamma-Gamma turbulence channel [PDF]
, 2011 Problem statement: The optical signal propagating through the Free Space Optical (FSO) channel suffers from irradiance and phase fluctuations caused by the atmospheric turbulence, which results in Bit Error Rate (BER) performance degradation ...
Ghassemlooy, Zabih +7 more
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Turbulence in the interstellar medium [PDF]
, 2014 Turbulence is ubiquitous in the insterstellar medium and plays a major role in several processes such as the formation of dense structures and stars, the stability of molecular clouds, the amplification of magnetic fields, and the re-acceleration and ...
Chian, A. C. -L. +9 more
core +1 more source
BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence
, 2009 Free-space optical communications (FSO) propagated over a clear atmosphere suffers from irradiance fluctuation caused by small but random atmospheric temperature fluctuations.
Ghassemlooy, Zabih +3 more
core +1 more source
Numerical Study of the Effect of Freestream Turbulence on by-pass Transition in a Boundary Layer [PDF]
, 2014 We use direct numerical simulations in the presence of free-stream turbulence having different values of intensity, T u, and integral length scale, L, in order to determine which kind of structures are involved in the path to transition of a boundary ...
Robinet, Jean Christophe +3 more
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Heat transfer from the stagnation area of a heated cylinder at Re(D) = 140,000 affected by free-stream turbulence [PDF]
, 2011 This is the post-print version of the final paper published in International Journal of Heat and Mass Transfer. The published article is available from the link below.
J.G. Wissink +3 more
core +1 more source
Outer layer turbulence intensities in smooth- and rough-wall boundary layers
, 2013 Clear differences in turbulence intensity profiles in smooth, transitional and fully rough zero-pressure-gradient boundary layers are demonstrated, using the diagnostic plot introduced by Alfredsson, Segalini & Örlü (Phys. Fluids, vol.
Alfredsson, Henrik +2 more
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The effect of atmospheric turbulence on the performance of the free space optical communications [PDF]
, 2008 In free space optical (FSO) communication links, atmospheric turbulence has a significant impact on the quality of a laser beam propagating through the atmosphere.
Ghassemlooy, Zabih +7 more
core +1 more source
BER and outage probability of DPSK subcarrier intensity modulated free space optics in fully developed speckle. [PDF]
, 2009 In this paper a differential phase shift keying (DPSK) subcarrier intensity modulated (SIM) free space optical (FSO) link is considered in negative exponential atmospheric turbulence environment.
Ghassemlooy, Zabih +4 more
core +1 more source