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arXiv 2605.09720physics.plasm-phphysics.comp-ph
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整合建模TRANSP代码对托卡马克等离子体的预测能力

Predictive capabilities of the integrated modeling TRANSP code for tokamak plasmas

Princeton Plasma Physics Laboratory(普林斯顿等离子体物理实验室);Rutgers University(罗格斯大学);General Atomics(通用原子能公司);University of California, Irvine(加州大学尔湾分校);Argonne National Laboratory(阿贡国家实验室)

A. Y. Pankin, J. Breslau, M. V. Gorelenkova, R. Budny, M. Goliyad, B. A. Grierson, G. W. Hammett, S. C. Jardin, J. B. Lestz, X. Yuan

AI总结:

本文探讨TRANSP代码在预测托卡马克等离子体中的能力,重点介绍PT_SOLVER模块和高保真T3D/GX框架的开发,用于基于高保真gyrokinetic模型的湍流输运预测。

摘要:

本文扩展了《计算机物理学通讯》312卷(2025)109611中对TRANSP的描述,详细介绍了TRANSP预测功能的最新进展,强调了PT_SOLVER模块和高保真T3D/GX框架的开发,用于利用高保真gyrokinetic模型进行等离子体剖面预测。PT_SOLVER是一个模块化、多区域、并行求解器,用于求解粒子密度、电子和离子能量以及托里切角动量的耦合输运方程,使用隐式牛顿方法推进这些方程的求解。数值公式包括源耦合、移动几何项和基于修改的佩克数的非线性稳定化,从而使得PT_SOLVER能够处理与梯度相关的输运模型的刚性问题。稳定化通过控制陡峭梯度或快速变化的输运系数区域的离散化来实现。源项包括加热、电流驱动、α粒子效应和碰撞性能量交换,这些都被充分处理,且使用残差范数和剖面变化度量来评估收敛性。通过分析基准解、制造解基准、刚性梯度依赖扩散率的收敛研究以及TGYRO与TGLF/NEO模型的代码间比较进行验证。本文还描述了TRANSP与模块化T3D/GX工作流的接口,并展示了与耦合预测模拟相关的接口验证示例。本文的结果证实,预测TRANSP框架在时间依赖预测输运模拟中具有稳健的数值实现,并为未来的混合降阶和高保真工作流提供了基础。

英文摘要:

This paper expands on the TRANSP description given in [Computer Physics Communications 312 (2025) 109611] by describing recent progress in TRANSP's predictive functionality and emphasizing development of the PT_SOLVER module and integration of the high-fidelity T3D/GX framework for plasma profile prediction using a high-fidelity gyrokinetic model for turbulent transport. PT_SOLVER is a modular, multi-region, parallel solver for coupled transport equations of particle density, electron and ion energy, and toroidal angular momentum that uses an implicit Newton method to advance the solution of these equations. The numerical formulation includes source coupling, moving-geometry terms, and nonlinear stabilization based on modified Péclet numbers, thereby enabling the PT_SOLVER to handle the stiffness associated with gradient-dependent transport models. Stabilization occurs via a nonlinear function controlling discretization in zones of steep gradients or rapidly changing transport coefficients. Source terms that account for heating, current drive, alpha-particle effects, and collisional energy exchange are handled thoroughly, and both residual norms and profile-change measures are used to assess convergence. Verification is carried out using analytical benchmark solutions, manufactured solution benchmarks, convergence studies of stiff gradient-dependent diffusivities, and code-to-code comparisons of TGYRO using the TGLF/NEO models for anomalous and neoclassical transport. A multi-level parallel decomposition strategy in PT_SOLVER is described for both flux surface and TGLF wavenumber parallelism, along with representative scaling results. This paper also describes the TRANSP Interface to the modular T3D/GX workflow and presents verification examples related to the interface for coupled prediction simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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