On coupling fluid plasma and kinetic neutral physics models

被引：3

作者：

Joseph, I. ^{[1
]}

Rensink, M. E. ^{[1
]}

Stotler, D. P. ^{[2
]}

Dimits, A. M. ^{[1
]}

LoDestro, L. L. ^{[1
]}

Porter, G. D. ^{[1
]}

Rognlien, T. D. ^{[1
]}

Sjogreen, B. ^{[1
]}

Umansky, M. V. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[2] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

来源：

NUCLEAR MATERIALS AND ENERGY | 2017年 / 12卷

关键词：

Divertor modeling; Charge exchange; Ionization; Recombination; Implicit; Newton-Krylov; UEDGE; DEGAS2; EIRENE; SOLPS; VOLUME/MONTE-CARLO CODES; NONLINEAR ACCELERATION; EDGE SIMULATIONS; TRANSPORT; CONVERGENCE; IMPLICIT; ACCURACY;

D O I：

10.1016/j.nme.2017.02.021

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The coupled fluid plasma and kinetic neutral physics equations are analyzed through theory and simulation of benchmark cases. It is shown that coupling methods that do not treat the coupling rates implicitly are restricted to short time steps for stability. Fast charge exchange, ionization and recombination coupling rates exist, even after constraining the solution by requiring that the neutrals are at equilibrium. For explicit coupling, the present implementation of Monte Carlo correlated sampling techniques does not allow for complete convergence in slab geometry. For the benchmark case, residuals decay with particle number and increase with grid size, indicating that they scale in a manner that is similar to the theoretical prediction for nonlinear bias error. Progress is reported on implementation of a fully implicit Jacobian-free Newton-Krylov coupling scheme. The present block Jacobi preconditioning method is still sensitive to time step and methods that better precondition the coupled system are under investigation. (C) 2017 Published by Elsevier Ltd.

引用

页码：813 / 818

页数：6

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