Zoom on vortex tubes with helical field lines Note intertwining of tubes Vapor software, NCAR Role o

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Zoom on vortex tubes with helical field
linesNote intertwining of tubes (Vapor software,
NCAR)Role of helicity (u.? x u) ?
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Thanks for your attention, and see you this
afternoon
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AMR in 2D-MHD

• Orszag-Tang vortex
• Current structures

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3-vortex interactions

• 31 levels of refinement

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• Zoom on vorticity
  Relative helicity (95 level)
• Local Beltramization Tsinober Levich (1983)
  Moffatt (1985) Farge et al. (2001) Holm Kerr
  (2002)
• --gt Role of helicity at small scales and slow
  return to isotropy

Relative Helicity Blue hgt 0.95
Red hlt-0.95