GRILLIX作为托卡马克和仿星器的统一流体湍流代码

IF 3.4 2区 物理与天体物理 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Andreas Stegmeir , Marion E. Finkbeiner , Christoph Pitzal , Joachim Geiger , Frank Jenko
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引用次数: 0

摘要

边缘流体湍流代码GRILLIX中的通量坐标无关(FCI)方法已被证明非常成功地用于托卡马克处理复杂转向几何中的各向异性湍流结构。我们将GRILLIX扩展到非轴对称几何,为托卡马克和仿星器维护一个统一的代码库。对于这一原理证明,三维磁构型是基于解析表达式的,可以调整到实验场景,我们通过各种数值测试和验证证明了代码正确解决仿星器几何形状的能力。我们将具有跨碰撞扩展的全局电磁漂移减少Braginskii流体模型和三矩流体中性模型应用于两种不同的情况。在第一种情况下,我们模拟了一个具有强加磁岛的配置,并观察了与解析理论一致的时间尺度上整个岛屿的剖面变平。在第二种情况下,我们在真实参数下对Wendelstein 7-AS (W7-AS)仿星器进行了全面的湍流模拟,包括通过浸入边界方法建模的分段目标板。经过初始瞬态后,等离子体以沙弗拉诺夫位移进入自洽平衡态。然后,我们观察到小尺度湍流,其特征是沿磁力线的强延伸,这驱动了粒子和热量的湍流跨场输运,最终定向到开放磁力线区域的目标板。值得注意的是,反映W7-AS的离散环面对称性的平行模式也存在。此外,我们介绍了一种新的方法来可视化数据从局部对齐的数值框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
GRILLIX as unified fluid turbulence code for tokamaks and stellarators
The Flux-Coordinate Independent (FCI) approach in the edge fluid turbulence code GRILLIX has proven very successful for tokamaks in handling anisotropic turbulent structures in complex diverted geometries. We extend GRILLIX to non-axisymmetric geometries, maintaining a single, unified codebase for both tokamaks and stellarators. For this proof of principle, the 3D magnetic configurations are based on analytical expressions, that can be adjusted to experimental scenarios, and we demonstrate the code's ability to resolve stellarator geometries correctly via various numerical tests and verifications. We apply the global electromagnetic drift-reduced Braginskii fluid model with trans-collisional extensions and a three-moment fluid neutrals model to two distinct cases. In the first case, we simulate a configuration with imposed magnetic islands and observe profile flattening across the island on time scales consistent with analytic theory. In the second case, we perform a comprehensive turbulence simulation of the Wendelstein 7-AS (W7-AS) stellarator at realistic parameters, including segmented target plates modeled via the immersed boundary approach. Following an initial transient phase, the plasma settles into a self-consistent equilibrium state with Shafranov shift. We then observe small-scale turbulence, characterized by strong elongation along magnetic field lines, which drives turbulent cross-field transport of particles and heat, ultimately directed to target plates in the open field line region. Notably, a parallel mode reflecting the discrete toroidal symmetry of W7-AS is also present. Furthermore, we introduce a novel approach for visualizing data from locally aligned numerical frameworks.
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来源期刊
Computer Physics Communications
Computer Physics Communications 物理-计算机:跨学科应用
CiteScore
12.10
自引率
3.20%
发文量
287
审稿时长
5.3 months
期刊介绍: The focus of CPC is on contemporary computational methods and techniques and their implementation, the effectiveness of which will normally be evidenced by the author(s) within the context of a substantive problem in physics. Within this setting CPC publishes two types of paper. Computer Programs in Physics (CPiP) These papers describe significant computer programs to be archived in the CPC Program Library which is held in the Mendeley Data repository. The submitted software must be covered by an approved open source licence. Papers and associated computer programs that address a problem of contemporary interest in physics that cannot be solved by current software are particularly encouraged. Computational Physics Papers (CP) These are research papers in, but are not limited to, the following themes across computational physics and related disciplines. mathematical and numerical methods and algorithms; computational models including those associated with the design, control and analysis of experiments; and algebraic computation. Each will normally include software implementation and performance details. The software implementation should, ideally, be available via GitHub, Zenodo or an institutional repository.In addition, research papers on the impact of advanced computer architecture and special purpose computers on computing in the physical sciences and software topics related to, and of importance in, the physical sciences may be considered.
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