40 citations · 55 across the 11 of their papers we have counts for
11 papers
The dynamical role of vortices in the two-dimensional inverse cascade of turbulence
V. J. Valadão, R. M. Pereira, L. Moriconi +1
We study the inverse energy cascade of two-dimensional turbulence by means of high-resolution numerical simulations forced at intermediate wavenumbers. To clarify the role of vorti…
Growth of small localized perturbations in Surface Quasi-Geostrophic turbulence
V. J. Valadão, M. Cencini, F. De Lillo +2
The butterfly effect, namely the amplification of an initially localized infinitesimal perturbation, is a fundamental hallmark of chaotic systems. While this phenomenon is well und…
Lagrangian chaos and the enstrophy cascade in Ekman-Navier-Stokes two-dimensional turbulence
Francesco Michele Ventrella, Victor de Jesus Valadão, Guido Boffetta +2
Two-dimensional turbulence with linear (Ekman) friction exhibits spectral properties that deviate from the classical Kraichnan prediction for the direct enstrophy cascade. In parti…
Scaling and Predictability in Surface Quasi-Geostrophic Turbulence
V. J. Valadão, F. De Lillo, S. Musacchio +1
Turbulent flows are strongly chaotic and unpredictable, with a Lyapunov exponent that increases with the Reynolds number. Here, we study the chaoticity of the Surface Quasi-geostro…
Spectrum correction in Ekman-Navier-Stokes turbulence
V. J. Valadão, G. Boffetta, F. De Lillo +2
The presence of a linear friction drag affects significantly the dynamics of turbulent flows in two-dimensions. At small scales, it induces a correction to the slope of the energy…
Non-equilibrium fluctuations of the direct cascade in Surface Quasi Geostrophic turbulence
V. J. Valadão, T. Ceccotti, G. Boffetta +1
We study the temporal fluctuations of the flux of surface potential energy in Surface Quasi-Geostrophic (SQG) turbulence. By means of high-resolution, direct numerical simulations…
Vortex polarization and circulation statistics in isotropic turbulence
L. Moriconi, R. M. Pereira, V. J. Valadão
We carry out an in-depth analysis of a recently introduced vortex gas model of homogeneous and isotropic turbulence. Direct numerical simulations are used to provide a concrete phy…
Circulation Statistics in Homogeneous and Isotropic Turbulence
V. J. Valadão
This is the final version of a Thesis presented to the PostGrad Program in Physics of the Physics Institute of the Federal University of Rio de Janeiro (UFRJ), as a necessary requi…
Eddy-Viscous Modeling and the Topology of Extreme Circulation Events in Three-Dimensional Turbulence
G. B. Apolinário, L. Moriconi, R. M. Pereira +1
We discuss the role of particular velocity field configurations -- instantons, for short -- which are supposed to dominate the flow during the occurrence of extreme turbulent circu…
Circulation Statistics and the Mutually Excluding Behavior of Turbulent Vortex Structures
Luca Moriconi, Rodrigo M. Pereira, Victor J. Valadão
The small-scale statistical properties of velocity circulation in classical homogeneous and isotropic turbulent flows are assessed through a modeling framework that brings together…
Vortex Gas Modeling of Turbulent Circulation Statistics
G. B. Apolinário, L. Moriconi, R. M. Pereira +1
Statistical properties of circulation encode relevant information about the multi-scale structure of turbulent cascades. Recent massive computational efforts have posed challenging…