• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physics of plasmas >Turbulence spreading and transport scaling in global gyrokinetic particle simulations
【24h】

Turbulence spreading and transport scaling in global gyrokinetic particle simulations

机译：整体动力学动力学粒子模拟中的湍流扩散和传输尺度

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An intriguing observation in magnetically confined plasma experiments and in global gyrokinetic particle simulations of toroidal ion temperature gradient turbulence is that the fluctuations are microscopic, while the resulting turbulent transport is not gyro-Bohm [Z. Lin , Phys. Rev. Lett. 88, 195004 (2002)]. A possible resolution to this puzzle is identified as turbulence spreading from the linearly active (unstable) region to the linearly inactive (stable) region. Large scale gyrokinetic simulations found that transport driven by microscopic fluctuations is diffusive and local, whereas the fluctuation intensity is determined by nonlocal effects. Fluctuations are found to spread from the linearly active region to the linearly inactive region. This turbulence spreading reduces the fluctuation intensity in the unstable region, especially for a smaller device size, and thus introduces a nonlocal dependence in the fluctuation intensity. The device size dependence of the fluctuation intensity, in turn, is responsible for the observed gradual transition from Bohm to gyro-Bohm transport scaling. (C) 2004 American Institute of Physics.
机译：在磁约束等离子体实验和环形离子温度梯度湍流的整体陀螺动力学粒子模拟中，一个有趣的发现是波动是微小的，而由此产生的湍流不是陀螺-鲍姆[Z。林物理牧师88，195004（2002）]。解决该难题的可能方法是将湍流从线性活动（不稳定）区域扩展到线性无效（稳定）区域。大规模的陀螺动力学模拟发现，微观波动驱动的输运具有扩散性和局部性，而波动强度则由非局部效应决定。发现波动从线性有效区域扩展到线性无效区域。这种湍流扩散减小了不稳定区域中的波动强度，特别是对于较小的装置尺寸而言，因此在波动强度中引入了非局部依赖性。器件大小对波动强度的依赖性进而导致观察到的从Bohm到陀螺-Bohm传输缩放的逐渐过渡。 （C）2004美国物理研究所。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号