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UID:UW-Physics-Event-4281
DTSTART:20161107T180000Z
DTEND:20161107T190000Z
DTSTAMP:20240319T134321Z
LAST-MODIFIED:20161031T151046Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Development and applications of Verication and Validation pro
cedures\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Fabio Riva\, E
cole Polytechnique Federale de Lausanne
DESCRIPTION:The methodology used to assess the reliability of numerica
l simulation codes constitutes the
\nVerication and Validation (V
&V) procedure. V&V is composed by three separate tasks: the code
\
nverication\, which is a mathematical issue targeted to assess that t
he physical model is correctly
\nimplemented in a simulation code\
; the solution verication\, which evaluates the numerical errors
\naecting a simulation\; and the validation\, which determines the co
nsistency of the code results\,
\nand therefore of the physical mo
del\, with experimental data.
\nTo perform a code verication\, we
propose to use the method of manufactured solutions\, a method-
\
nology that we have generalized to PIC codes\, overcoming the diculty
of dealing with a numerical
\nmethod intrinsically aected by sta
tistical noise. The solution verication procedure we put for-
\nw
ard is based on the Richardson extrapolation\, used as higher order es
timate of the exact solution.
\nThese verication procedures were
applied to GBS\, a three-dimensional
\nuid code for SOL plasma
\nturbulence simulation based on a nite dierence scheme\, and to a
unidimensional\, electrostatic\,
\ncollisionless PIC code. To per
form a detailed validation of GBS against experimental measure-
\n
ments\, we generalized the magnetic geometry of the simulation code to
include elongation and
\nnon-zero triangularity\, and we investig
ated theoretically the impact of plasma shaping eects on
\nSOL tu
rbulence. An experimental campaign to validate our ndings against exp
erimental mea-
\nsurements in tokamak limited congurations has ju
st been completed on TCV.
URL:https://www.physics.wisc.edu/events/?id=4281
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