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SUMMARY:Verification and validation procedures with applications to plasma
 -edge turbulence simulations
DTSTART:20170717T103000
DTEND:20170717T113000
DTSTAMP:20260407T051241Z
UID:2b209b6b8cc8c06b49ec6041bc941b1d0df285c8f7add99503bc94c4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. F. Riva\, SPC-EPFL\nThe methodology used to assess the rel
 iability of numerical simulation codes constitutes the Verification and Va
 lidation (V&V) procedure. V&V is composed by three separate tasks: the cod
 e verification\, which is a mathematical issue targeted to assess that the
  physical model is correctly implemented in a simulation code\; the soluti
 on verification\, which evaluates the numerical errors affecting a simulat
 ion\; and the validation\, which determines the consistency of the code re
 sults\, and therefore of the physical model\, with experimental data.\nTo 
 perform a code verification\, we propose to use the method of manufactured
  solutions\, a methodology that we have generalized to PIC codes\, overcom
 ing the difficulty of dealing with a numerical method intrinsically affect
 ed by statistical noise. The solution verification procedure we put forwar
 d is based on the Richardson extrapolation\, used as higher order estimate
  of the exact solution. These verification procedures were applied to GBS\
 , a three-dimensional fluid code for SOL plasma turbulence simulation base
 d on a finite difference scheme\, and to a unidimensional\, electrostatic\
 , collisionless PIC code.\nFinally\, in order to increase the reliability 
 of our SOL modelling\, several plasma turbulence simulation codes are vali
 dated against measurements taken in a number of experimental devices. Firs
 t\, the blob dynamics is investigated in TORPEX through a multi-code valid
 ation project\, shedding light on the dynamics of these structures. Furthe
 rmore\, GBS simulations are validated against RFX-mod experimental measure
 ments\, providing interesting insights on the SOL plasma dynamics in this 
 device. Finally\, the impact of the shape of the magnetic equilibrium on S
 OL turbulence is investigated through a rigorous validation of GBS simulat
 ions against TCV experimental measurements
LOCATION:PPB019
STATUS:CONFIRMED
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