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SUMMARY:Exact decomposition of energy fluxes in magnetohydrodynamic turbul
 ence - Moritz Linkmann (University of Edinburgh)
DTSTART:20240119T111500Z
DTEND:20240119T114500Z
UID:TALK209890@talks.cam.ac.uk
DESCRIPTION:Recently\, for Navier-Stokes turbulence\, an exact decompositi
 on of the energy flux across scales has been derived\; this identifies the
  flux contributions associated with vortex stretching and strain self-ampl
 ification. In the context of large-scale structure formation\, it identifi
 es the physical processes related to inverse cascades in turbulent flows. 
 Here\, we extend the formalism to general coupled advection-diffusion equa
 tions. The resulting flux decompositions can be readily applied to problem
 s involving the dynamics of active and passive scalars and vectors. We use
  the method to calculate magnetic and kinetic energy fluxes for magnetohyd
 rodynamic (MHD) turbulence. The aim is to disentangle and quantify the rel
 ative contributions of current-sheet thinning by vorticity gradients and s
 train-current coupling to the energy cascade in MHD.\nI would like to disc
 uss to what extent this approach can be leveraged especially in the plasma
  context on various levels of fluid approximations.
LOCATION:Seminar Room 1\, Newton Institute
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