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pro vyhledávání: '"Procaccia, Itamar"'
In light of some recent experiments on quasi two-dimensional (2D) turbulent channel flow we provide here a model of the ideal case, for the sake of comparison. The ideal 2D channel flow differs from its 3D counterpart by having a second quadratic con
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ce955cd212c3884f12606473424775a
We propose a new approach to the old-standing problem of the anomaly of the scaling exponents of nonlinear models of turbulence. We achieve this by constructing, for any given nonlinear model, a linear model of passive advection of an auxiliary field
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b221baaa9336c097cb204b80e20176e1
Drag reduction by polymers in wall turbulence is bounded from above by a universal maximal drag reduction (MDR) velocity profile that is a log-law, estimated experimentally by Virk as $V^+(y^+)\approx 11.7 \log y^+ -17$. Here $V^+(y)$ and $y^+$ are t
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Drag reduction in stationary turbulent flows by bubbles is sensitive to the dynamics of bubble oscillations. Without this dynamical effect the bubbles only renormalize the fluid density and viscosity, an effect that by itself can only lead to a small
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The weak version of universality in turbulence refers to the independence of the scaling exponents of the $n$th order strcuture functions from the statistics of the forcing. The strong version includes universality of the coefficients of the structur
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We consider shell models that display an inverse energy cascade similar to 2-dimensional turbulence (together with a direct cascade of an enstrophy-like invariant). Previous attempts to construct such models ended negatively, stating that shell model
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe683ecb7f8be142426a6e36a8873de7
http://arxiv.org/abs/nlin/0201020
http://arxiv.org/abs/nlin/0201020
The statistics of 2-dimensional turbulence exhibit a riddle: the scaling exponents in the regime of inverse energy cascade agree with the K41 theory of turbulence far from equilibrium, but the probability distribution functions are close to Gaussian
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We study the geometrical characteristic of quasi-static fractures in disordered media, using iterated conformal maps to determine the evolution of the fracture pattern. This method allows an efficient and accurate solution of the Lam\'e equations wit
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Autor:
Davidovich, Benny, Procaccia, Itamar
Diffusion Limited Aggregation (DLA) is a model of fractal growth that was introduced in 1981 and had since attained a paradigmatic status due to its simplicity and its underlying role for a variety of pattern forming processes. Despite tremendous eff
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbe7194dc39e05ea45d8f7e963ce2184
http://arxiv.org/abs/cond-mat/0003044
http://arxiv.org/abs/cond-mat/0003044
Many models of fractal growth patterns (like Diffusion Limited Aggregation and Dielectric Breakdown Models) combine complex geometry with randomness; this double difficulty is a stumbling block to their elucidation. In this paper we introduce a wide
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