Scaling Laws
Mostrando 25-31 de 31 artigos, teses e dissertações.
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25. Characteristic length scale of the intermediate structure in zero-pressure-gradient boundary layer flow
In a turbulent boundary layer over a smooth flat plate with zero pressure gradient, the intermediate structure between the viscous sublayer and the free stream consists of two layers: one adjacent to the viscous sublayer and one adjacent to the free stream. When the level of turbulence in the free stream is low, the boundary between the two layers is sharp,
The National Academy of Sciences.
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26. Small viscosity asymptotics for the inertial range of local structure and for the wall region of wall-bounded turbulent shear flow.
The small viscosity asymptotics of the inertial range of local structure and of the wall region in wallbounded turbulent shear flow are compared. The comparison leads to a sharpening of the dichotomy between Reynolds number dependent scaling (power-type) laws and the universal Reynolds number independent logarithmic law in wall turbulence. It further leads t
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27. A model of a turbulent boundary layer with a nonzero pressure gradient
According to a model of the turbulent boundary layer that we propose, in the absence of external turbulence the intermediate region between the viscous sublayer and the external flow consists of two sharply separated self-similar structures. The velocity distribution in these structures is described by two different scaling laws. The mean velocity u in the r
The National Academy of Sciences.
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28. Wavelet analysis of shoreline change on the Outer Banks of North Carolina: An example of complexity in the marine sciences
The horizontal, shore-perpendicular change in shoreline position along the Outer Banks of North Carolina is found to be a self-affine signal. We measure shoreline change by determining the horizontal change in position of the 0.8-m contour sampled from shore-perpendicular profiles spaced at 20-m intervals along the coast. The profiles are obtained from two l
National Academy of Sciences.
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29. The elements of draping
We consider the gravity-induced draping of a 3D object with a naturally flat, isotropic elastic sheet. As the size of the sheet increases, we observe the appearance of new folded structures of increasing complexity that arise because of the competition between elasticity and gravity. We analyze some of the simpler 3D structures by determining their shape and
National Academy of Sciences.
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30. The influence of the flow of the reacting gas on the conditions for a thermal explosion
The classical problem of thermal explosion is modified so that the chemically active gas is not at rest but is flowing in a long cylindrical pipe. Up to a certain section the heat-conducting walls of the pipe are held at low temperature so that the reaction rate is small and there is no heat release; at that section the ambient temperature is increased and a
The National Academy of Sciences of the USA.
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31. Self-organized complexity in economics and finance
This article discusses some of the similarities between work being done by economists and by physicists seeking to contribute to economics. We also mention some of the differences in the approaches taken and seek to justify these different approaches by developing the argument that by approaching the same problem from different points of view, new results mi
National Academy of Sciences.