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• W2237852048 startingPage "369" @default.
• W2237852048 abstract "We investigate the statistical properties, based on numerical simulations and analytical calculations, of a recently proposed stochastic model for the velocity field (Chevillard et al. , Europhys. Lett. , vol. 89, 2010, 54002) of an incompressible, homogeneous, isotropic and fully developed turbulent flow. A key step in the construction of this model is the introduction of some aspects of the vorticity stretching mechanism that governs the dynamics of fluid particles along their trajectories. An additional further phenomenological step aimed at including the long range correlated nature of turbulence makes this model dependent on a single free parameter, ${itgamma}$ , that can be estimated from experimental measurements. We confirm the realism of the model regarding the geometry of the velocity gradient tensor, the power-law behaviour of the moments of velocity increments (i.e. the structure functions) including the intermittent corrections and the existence of energy transfer across scales. We quantify the dependence of these basic properties of turbulent flows on the free parameter ${itgamma}$ and derive analytically the spectrum of exponents of the structure functions in a simplified non-dissipative case. A perturbative expansion in power of ${itgamma}$ shows that energy transfer, at leading order, indeed take place, justifying the dissipative nature of this random field." @default.
• W2237852048 created "2016-06-24" @default.
• W2237852048 creator A5013051381 @default.
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• W2237852048 date "2016-04-04" @default.
• W2237852048 modified "2023-09-25" @default.
• W2237852048 title "A dissipative random velocity field for fully developed fluid turbulence" @default.
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• W2237852048 doi "https://doi.org/10.1017/jfm.2016.166" @default.
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