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SUMMARY:GRILLIX: A 3D turbulence code for magnetic fusion devices based on
  a field line map
DTSTART:20160119T140000
DTEND:20160119T150000
DTSTAMP:20260511T065801Z
UID:3c7848d4244007000aa4f9fcdf3be8f598a03d87cf53dd32795c893d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. A. Stegmeir\, Max-Planck-Institut für Plasmaphysik\, Garc
 hing\, Germany\nThe complex geometry in the edge and scrape-off layer pose
 s a challenge to simulations of magnetically confined plasmas. The usually
  employed field/flux-aligned coordinates become singular on the separatrix
 /X-point. The field line map approach constitutes a promising solution to 
 these problems. The approach is based on a cylindrical grid\, and the char
 acteristic flute mode property (k||<<k^) of structures is exploited comput
 ationally via grid sparsification in the toroidal direction. A field line 
 following discretisation for parallel operators is then required\, which i
 ncludes field line tracing and interpolation or integration. The seperatri
 x and the X-point(s) are thereby handled without any special treatment. Ho
 wever\, a major drawback of the approach is numerical perpendicular diffus
 ion caused by numerical coupling among distinct field lines. A new numeric
 al scheme for the parallel diffusion operator is presented\, which is base
 d on the support operator method and exhibits only a very low level of num
 erical diffusion. The concept is implemented in the code GRILLIX: Extensiv
 e benchmarks show the validity of the field line map approach in general a
 nd GRILLIX in particular. Results obtained with a simple turbulence model 
 (Hasegawa-Wakatani)\, concerning geometric effects of the X-point on turbu
 lent structures\, are shown. An outlook and first results of current effor
 t is given\, which adresses the extension of the physical model in GRILLIX
  towards a full-f drift reduced Braginskii model.
LOCATION:PPB 019
STATUS:CONFIRMED
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