Simulation of edge localized modes using BOUT++
Simulation of edge localized modes using BOUT++
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DOI：
10.1088/0741-3335/53/5/054005
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发表时间：
2010-08
影响因子：
2.2
通讯作者：
B. Dudson;X. Q. Xu;M. V. Umansky;H. Wilson;P. Snyder
中科院分区：
文献类型：
--
作者：
B. Dudson;X. Q. Xu;M. V. Umansky;H. Wilson;P. Snyder
利用but++代码模拟移圆平衡中的边缘局域模式（elm）。简化的理想MHD模拟首先与线性理想MHD代码ELITE进行基准测试，显示出良好的一致性。抗磁漂移效应包括寻找高环面模数模式的预期抑制。在假定反常运动电子粘度与反常电子热扩散系数相当的情况下，进行了非线性模拟。这允许模拟具有实际高的伦德奎斯特数字（S = 108），发现ELM尺寸为基座存储热能的5-10%。扫描显示，在低伦德奎斯特数值处，ELM的大小与电阻率有很强的依赖性，电阻率越高，火山爆发越猛烈。在与高性能放电相关的高伦德奎斯特数下，ELM尺寸与电阻率无关，因为超电阻率成为主要的耗散效应。
The BOUT++ code is used to simulate edge localized modes (ELMs) in a shifted circle equilibrium. Reduced ideal MHD simulations are first benchmarked against the linear ideal MHD code ELITE, showing good agreement. Diamagnetic drift effects are included finding the expected suppression of high toroidal mode-number modes. Nonlinear simulations are performed, making the assumption that the anomalous kinematic electron viscosity is comparable to the anomalous electron thermal diffusivity. This allows simulations with realistically high Lundquist numbers (S = 108), finding ELM sizes of 5–10% of the pedestal stored thermal energy. Scans show a strong dependence of the ELM size on resistivity at low Lundquist numbers, with higher resistivity leading to more violent eruptions. At high Lundquist numbers relevant to high-performance discharges, ELM size is independent of resistivity as hyper-resistivity becomes the dominant dissipative effect.