带背景流和磁切变的局部陀螺动力学模拟的旋转通量管模型

IF 3.8 2区物理与天体物理 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Journal of Computational Physics Pub Date : 2024-11-19 DOI:10.1016/j.jcp.2024.113595

Shinya Maeyama , Tomo-Hiko Watanabe , Motoki Nakata , Masanori Nunami , Yuuichi Asahi , Akihiro Ishizawa

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引用次数: 0

摘要

我们开发了一种名为旋转通量管模型的新计算方法，用于处理局部陀螺动能模拟中的背景剪切流。该方法基于扩展的磁流体力学气球模式理论。坐标变换使磁通管模拟域沿剪切磁场线移动，抵消了背景剪切流引起的变形。线性分析表明，旋转磁通管模型将剪切流下波动的时间连续演化描述为单波数模式。旋转通量管模型的表述明确了其与 Floquet 理论的数学对应关系。非线性模拟表明，旋转通量管模型可以分析背景剪切流对湍流传输的影响。

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Rotating flux-tube model for local gyrokinetic simulations with background flow and magnetic shears

We have developed a new computational method called the rotating flux-tube model that treats background shear flows in local gyrokinetic simulations. The method is based on extended magnetohydrodynamic ballooning mode theory. A coordinate transformation moves the flux-tube simulation domain along the sheared magnetic field lines, counteracting the deformation caused by the background shear flow. Linear analyses showed that the rotating flux-tube model describes the time-continuous evolution of fluctuations under shear flow as a single wavenumber mode. The formulation of the rotating flux-tube model makes explicit its mathematical correspondence to the Floquet theory. Nonlinear simulations demonstrated that the rotating flux-tube model can analyze the effects of background shear flow on turbulent transport.

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来源期刊

Journal of Computational Physics 物理-计算机：跨学科应用

CiteScore

7.60

自引率

14.60%

发文量

763

审稿时长

5.8 months

期刊介绍： Journal of Computational Physics thoroughly treats the computational aspects of physical problems, presenting techniques for the numerical solution of mathematical equations arising in all areas of physics. The journal seeks to emphasize methods that cross disciplinary boundaries. The Journal of Computational Physics also publishes short notes of 4 pages or less (including figures, tables, and references but excluding title pages). Letters to the Editor commenting on articles already published in this Journal will also be considered. Neither notes nor letters should have an abstract.