Development of the fluid-type transport code on the flux coordinates in a tokamak

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• 作者：Mitsuru Honda^a ; ^{honda.mitsuru@qst.go.jp" class="auth_mail" title="E-mail the corresponding author} ; Atsushi Fukuyama^b
• 关键词：Transport code ; Two-fluid model ; Flux coordinates ; Neoclassical transport ; Radial electric field ; Tokamak
• 刊名：Computer Physics Communications
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：208
• 期：Complete
• 页码：117-134
• 全文大小：743 K

文摘

The one-dimensional fluid-type transport code, TASK/TX, is developed compatible with the flux coordinates in a tokamak. Unlike diffusive transport equations usually adopted in conventional transport codes, the governing equations conform to a two-fluid model consisting of Maxwell’s equations and the multiple fluid moment equations for each species.Quasi-neutrality and ambipolar flux conditions are not imposed, which are inherently satisfied as a consequence of the equation system solved. The neoclassical particle flux is not approximated by the flux–gradient relationship, and the total particle flux composed of the neoclassical and turbulent contributions is directly treated as the dependent variable. The quantities related to neoclassical transport are intrinsically calculated without external neoclassical transport modules. In other words, TASK/TX by itself has the function of a neoclassical transport solver based on the moment approach as well. Several numerical tests clearly reveal the unique features of TASK/TX not possessed by conventional transport codes.