Sudden diffusion of turbulent mixing layers in weakly coupled plasmas under compression

Giovanni Viciconte, Benoît-Joseph Gréa, Fabien S. Godeferd, Philippe Arnault, and Jean Clérouin
Phys. Rev. E 100, 063205 – Published 13 December 2019

Abstract

The rapid growth of viscosity driven by temperature increase in turbulent plasmas under compression induces a sudden dissipation of kinetic energy, eventually leading to the relaminarization of the flow [Davidovits and Fisch, Phys. Rev. Lett. 116, 105004 (2016)]. The interdiffusion between species is also greatly enhanced, so that mixing layers appearing at interfaces between different materials are subjected to strong dynamical modifications. The result is a competition between the vanishing turbulent diffusion and the expanding plasma microscopic diffusion. In direct numerical simulations with conditions relevant to inertial confinement fusion, we evidence regimes where compressed spherical mixing layers are quickly diffused during the relaminarization process. Using one and two-point turbulent statistics, we also detail how mixing heterogeneities are smoothed out.

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  • Received 18 July 2019
  • Revised 31 October 2019

DOI:https://doi.org/10.1103/PhysRevE.100.063205

©2019 American Physical Society

Physics Subject Headings (PhySH)

Plasma PhysicsFluid Dynamics

Authors & Affiliations

Giovanni Viciconte

  • CEA, DAM, DIF, F-91297 Arpajon, France and LMFA UMR5509—CNRS, Université de Lyon, École centrale de Lyon, Université Claude Bernard Lyon 1, INSA Lyon, Écully, France

Benoît-Joseph Gréa

  • CEA, DAM, DIF, F-91297 Arpajon, France

Fabien S. Godeferd

  • LMFA UMR5509—CNRS, Université de Lyon, École centrale de Lyon, Université Claude Bernard Lyon 1, INSA Lyon, Écully, France

Philippe Arnault and Jean Clérouin

  • CEA, DAM, DIF, F-91297 Arpajon, France

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Issue

Vol. 100, Iss. 6 — December 2019

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