Results 271 to 280 of about 19,278,057 (340)
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Coherent structures in tornado-like vortices
Physics of Fluids, 2019The dynamics of tornadolike vortices is investigated through a set of novel physical experiments and modal analyses for a wide range of swirl ratios (0.22 ≤ S ≤ 0.96). Various physical phenomena such as wandering, vortex breakdown, or transition from one-
M. Karami +3 more
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Coherent structures in the turbulent channel flow of an elastoviscoplastic fluid
Journal of Fluid Mechanics, 2020In this numerical and theoretical work, we study the turbulent channel flow of Newtonian and elastoviscoplastic fluids. The coherent structures in these flows are identified by means of higher order dynamic mode decomposition (HODMD), applied to a set of
S. Le Clainche +4 more
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Asymmetrical inseparable coherent structures
Optics Letters, 2022A novel, to the best of our knowledge, class of coherent structures of inseparability, incorporating phases asymmetrically cross-coupled by two position vectors, is introduced in theory and experiment. These phases disappear in the environment of complete coherence, but the vanishment is avoidable in the coexistent state of extreme incoherence and full
Zehong Liang +7 more
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Coherent structures in multidimensions
Physical Review Letters, 1989We solve an initial-boundary value problem for the Davey-Stewartson equation, a multidimensional analog of the nonlinear Schr\"odinger equation. It is shown that for large time, an arbitrary initial disturbance will, in general, decompose into a number of two-dimensional coherent structures. These structures exhibit interesting novel features not found
Fokas AS, SANTINI, Paolo Maria
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‘Coherent Structures in turbulence’
Journal of Fluid Mechanics, 1975This account of the Colloquium on Coherent Structures in Turbulence held at Southampton from 26-29 March 1974 presents a brief summary of two invited lectures and 42 formal presentations on turbulent shear-flow structure. A number of shorter contributions and discussions are also outlined.
Davies, P. O. A. L., Yule, A. J.
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Lagrangian Coherent Structures
Annual Review of Fluid Mechanics, 2015 Typical fluid particle trajectories are sensitive to changes in their initial conditions. This makes the assessment of flow models and observations from individual tracer samples unreliable. Behind complex and sensitive tracer patterns, however, there exists a robust skeleton of material surfaces, Lagrangian coherent structures (LCSs), shaping those ...
G. Haller
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Challenges in Scale-Resolving Simulations of turbulent wake flows with coherent structures
Journal of Computational Physics, 2018The objective of this work is to investigate the challenges encountered in Scale-Resolving Simulations (SRS) of turbulent wake flows driven by spatially-developing coherent structures.
F. Pereira, L. Eça, G. Vaz, S. Girimaji
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Geophysics, 1974
Abstract The wavefield generated at the surface of the earth from a surface seismic source can be represented as a function F(f, k) in the frequency wave?number domain. This function depends upon the source and the propagation characteristics of the underlying structure.
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Abstract The wavefield generated at the surface of the earth from a surface seismic source can be represented as a function F(f, k) in the frequency wave?number domain. This function depends upon the source and the propagation characteristics of the underlying structure.
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Study of the structure of coherent emulsions
International Journal of Pharmaceutics, 2003The object of the study was to analyse relationship between the rheological properties, thermogravimetric behaviour, physical stability, and the wetting contact angle of the lipophilic and aqueous phase of 300 creams of different compositions with a high water content (60-80%, w/w). The starting point was Junginger's theory: water is found in the cream
István, Eros +2 more
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