Results 11 to 20 of about 14,788,176 (350)
Partially coherent light beam shaping via complex spatial coherence structure engineering
Advances in Physics: X, 2022 The techniques of optical beam shaping have enabled progress in a broad range of interdisciplinary science and engineering, owing to the unique properties and promising applications of their created structured light.
Yahong Chen, Fei Wang, Yangjian Cai
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The emergence of a coherent structure for coherent structures: localized states in nonlinear systems [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2010 Coherent structures emerge from the dynamics of many kinds of dissipative, externally driven, nonlinear systems, and continue to provoke new questions that challenge our physical and mathematical understanding. In one specific subclass of such problems, in which a pattern-forming, or ‘Turing’, instability occurs, rapid progress has been made recently ...
Jonathan H. P. Dawes
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, 2012 In this paper, we calculated the spatial local-averaged velocity strains along the streamwise direction at four spatial scales according to the concept of spatial local-averaged velocity structure function by using the three-dimensional three-component ...
Yang SQ +3 more
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On coherent structure in wall turbulence [PDF]
Journal of Fluid Mechanics, 2013 A new theory of coherent structure in wall turbulence is presented. The theory is the first to predict packets of hairpin vortices and other structure in turbulence, and their dynamics, based on an analysis of the Navier-Stokes equations, under an ...
Sharma, A.S. +3 more
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Identification of individual coherent sets associated with flow trajectories using coherent structure coloring [PDF]
Chaos, 2017 We present a method for identifying the coherent structures associated with individual Lagrangian flow trajectories even where only sparse particle trajectory data are available. The method, based on techniques in spectral graph theory, uses the Coherent
Schlueter-Kuck, Kristy L. +1 more
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First coherent structure in elasto-inertial turbulence [PDF]
Physical Review Fluids, 2020 Two dimensional channel flow simulations of FENE-P fluid in the elasto-inertial turbulence regime reveal distinct regimes ranging from chaos to a steady travelling wave which takes the form of an arrowhead structure.
Y. Dubief +4 more
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A critical comparison of Lagrangian methods for coherent structure detection. [PDF]
Chaos, 2017 We review and test twelve different approaches to the detection of finite-time coherent material structures in two-dimensional, temporally aperiodic flows. We consider both mathematical methods and diagnostic scalar fields, comparing their performance on
Alireza Hadjighasem +4 more
semanticscholar +1 more source
Frontiers in Physics, 2020 Turbulent density fluctuations are investigated in the solar wind at sub-ion scales using calibrated spacecraft potential. The measurement technique using the spacecraft potential allows for a much higher time resolution and sensitivity when compared to ...
Owen Wyn Roberts +6 more
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Coherent structure colouring: identification of coherent structures from sparse data using graph theory [PDF]
Journal of Fluid Mechanics, 2016 We present a frame-invariant method for detecting coherent structures from Lagrangian flow trajectories that can be sparse in number, as is the case in many fluid mechanics applications of practical interest. The method, based on principles used in graph
Kristy L. Schlueter-Kuck, J. Dabiri
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Coherent structure analysis of spatiotemporal chaos
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 2000 We introduce a measure to quantify spatiotemporal turbulence in extended systems. It is based on the statistical analysis of a coherent structure decomposition of the evolving system.
Wang, Jichang +3 more
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