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DTSTAMP:20220812T074335Z
LOCATION:Darwin Room
DTSTART;TZID=Europe/Stockholm:20220629T153000
DTEND;TZID=Europe/Stockholm:20220629T160000
UID:submissions.pasc-conference.org_PASC22_sess153_msa176@linklings.com
SUMMARY:Gyrokinetic Nonlinear Simulations of Turbulent Transport based on 
 a Hermite-Laguerre Moments Approach and Different Collision Models
DESCRIPTION:Minisymposium\n\nGyrokinetic Nonlinear Simulations of Turbulen
 t Transport based on a Hermite-Laguerre Moments Approach and Different Col
 lision Models\n\nHoffmann, Frei, Ricci\n\n<em>We present the first nonline
 ar gyrokinetic simulations based on a moment approach, which exploits the 
 Hermite-Laguerre decomposition of the ion and electron distribution functi
 ons. The simulations are used to evolve turbulence in a local Z-pinch conf
 iguration and are accurately benchmarked against the continuous code GENE 
 in the collisionless regime. Despite the large number of moments needed fo
 r the convergence of the linear growth rate, in the nonlinear regime the m
 oment approach shows a very good agreement with GENE, even with a reduced 
 set of moments. By including advanced linear collision operator as matrice
 s, for the first time we reveal the fundamental role of the collision oper
 ator model in turbulent transport, in particular through the zonal flows d
 amping at drives below the Dimits threshold. We also confirm that the conv
 ergence of the moment approach is improved when collisions are included in
  the system. Our results show the potential of the method to provide an ef
 ficient implementation of the gyrokinetic model in more complex configurat
 ions, in particular at high collisionality. <br /> </em>\n\nDomain: Comput
 er Science and Applied Mathematics, Physics
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