12 papers
Intermittency in two-dimensional Ekman-Navier-Stokes turbulence
G. Boffetta, A. Celani, S. Musacchio +1
We study the statistics of the vorticity field in two-dimensional Navier-Stokes turbulence with a linear Ekman friction. We show that the small-scale vorticity fluctuations are int…
Universal decay of scalar turbulence
M. Chaves, G. Eyink, U. Frisch +1
The asymptotic decay of passive scalar fields is solved analytically for the Kraichnan model, where the velocity has a short correlation time. At long times, two universality class…
Fronts in passive scalar turbulence
A. Celani, A. Lanotte, A. Mazzino +1
The evolution of scalar fields transported by turbulent flow is characterized by the presence of fronts, which rule the small-scale statistics of scalar fluctuations. With the aid…
Statistical geometry in scalar turbulence
A. Celani, M. Vergassola
A general link between geometry and intermittency in passive scalar turbulence is established. Intermittency is qualitatively traced back to events where tracer particles stay for…
Universality and saturation of intermittency in passive scalar turbulence
A. Celani, A. Lanotte, A. Mazzino +1
The statistical properties of a scalar field advected by the non-intermittent Navier-Stokes flow arising from a two-dimensional inverse energy cascade are investigated. The univers…
Small-scale turbulent dynamo
M. Chertkov, G. Falkovich, I. Kolokolov +1
Kinematic dynamo theory is presented here for turbulent conductive fluids. We describe how inhomogeneous magnetic fluctuations are generated below the viscous scale of turbulence w…