首页> 外文OA文献 >Kinetic simulation of steady states of ion temperature gradient driven turbulence with weak collisionality
【2h】

Kinetic simulation of steady states of ion temperature gradient driven turbulence with weak collisionality

机译:弱碰撞性的离子温度梯度驱动湍流稳态的动力学模拟

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Statistically steady states of the ion temperature gradient driven turbulence with weak collisionality, where the collision frequency is much lower than characteristic ones of the turbulence, are investigated by means of a Eulerian kinetic simulation with high resolution. In the saturated state of the entropy variable, the ion heat transport balances with the collisional dissipation that is indispensable to realizing a steady-turbulence state of perturbed distribution function deltaf. The kinetic simulation definitely confirms the conventional hypothesis that, in a low-collisionality limit, the low-order velocity-space moments of deltaf as well as the ion heat transport flux agree with those in the quasisteady state of the collisionless turbulence with the constant entropy production. A spectral analysis of deltaf in the velocity-space clarifies the transfer and dissipation processes of the entropy variable associated with fluctuations, where the phase mixing, the E×B nonlinearity, and the finite collisionality are taken into account. A power-law scaling predicted by the theoretical analysis is also verified by the simulations in a subrange of the power spectrum which is free from the entropy production and the collisional dissipation.
机译:通过高分辨率的欧拉动力学模拟研究了具有弱碰撞性的离子温度梯度驱动湍流的统计稳态,在该稳态下碰撞频率远低于湍流的特征频率。在熵变量的饱和状态下,离子传热与碰撞耗散保持平衡,这对于实现扰动的分布函数deltaf的稳态湍流状态是必不可少的。动力学模拟无疑证实了传统的假设,即在低碰撞极限下,Δf的低阶速度-空间矩以及离子传热通量与具有恒定熵的无碰撞湍流的准稳态相一致。生产。在速度空间中对deltaf进行频谱分析,可以清楚地看出与波动相关的熵变量的传递和耗散过程,其中考虑了相混合,E×B非线性和有限碰撞性。通过理论分析预测的幂律定标也通过仿真在功率谱的一个子范围内得到验证,该子范围没有熵产生和碰撞耗散。

著录项

  • 作者

    T.-H. Watanabe; H. Sugama;

  • 作者单位
  • 年度 2004
  • 总页数
  • 原文格式 PDF
  • 正文语种 en
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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