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A phenomenological two-fluid model of the (time-reversible) spectrally-truncated 3D Euler equation is proposed. The thermalized small scales are first shown to be quasi-normal. The effective viscosity and thermal diffusion are then determined, using EDQNM closure and Monte-Carlo numerical computations. Finally, the model is validated by comparing its… (More)

- J D Gibbon, A Gupta, +6 authors J Stawarz
- Physical review. E
- 2016

It is shown how suitably scaled, order-m moments, D_{m}^{±}, of the Elsässer vorticity fields in three-dimensional magnetohydrodynamics (MHD) can be used to identify three possible regimes for solutions of the MHD equations with magnetic Prandtl number P_{M}=1. These vorticity fields are defined by ω^{±}=curlz^{±}=ω±j, where z^{±} are Elsässer variables,… (More)

- G. Krstulovic, J. Bec
- 2013

A dilute system of reacting particles transported by fluid flows is considered. The particles react as A + A → ∅ with a given rate when they are within a finite radius of interaction. The system is described in terms of the joint n-point number spatial density that it is shown to obey a hierarchy of transport equations. An analytic solution is obtained in… (More)

- Giorgio Krstulovic, Carlos Cartes, Marc Brachet, Enrique Tirapegui
- I. J. Bifurcation and Chaos
- 2009

A short review is given of recent papers on the relaxation to (incompressible) absolute equilibrium. A new algorithm to construct absolute equilibrium of spectrally truncated compressible flows is described. The algorithm uses stochastic processes based on the Clebsch representation of the velocity field to generate density and velocity fields that follow… (More)

The UCD community has made this article openly available. Please share how this access benefits you. Your story matters! (@ucd_oa) Some rights reserved. For more information, please see the item record link above. We investigate the ideal and incompressible magnetohydrodynamic (MHD) equations in three space dimensions for the development of potentially… (More)

- Alberto Villois, Davide Proment, Giorgio Krstulovic
- Physical review. E
- 2016

The development and decay of a turbulent vortex tangle driven by the Gross-Pitaevskii equation is studied. Using a recently developed accurate and robust tracking algorithm, all quantized vortices are extracted from the fields. The Vinen's decay law for the total vortex length with a coefficient that is in quantitative agreement with the values measured in… (More)

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