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首页> 外文期刊>Nuclear fusion >Nonlinear fluid simulation of particle and heat fluxes during burst of ELMs on DⅢ-D with BOUT++ code
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Nonlinear fluid simulation of particle and heat fluxes during burst of ELMs on DⅢ-D with BOUT++ code

机译：使用BOUT ++代码在DⅢ-D上ELM爆炸过程中粒子和热通量的非线性流体模拟

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摘要

In order to study the distribution and evolution of the transient particle and heat fluxes during edge-localized mode (ELM) bursts, a BOUT++ six-field two-fluid model based on the Braginskii equations with non-ideal physics effects is used to simulate pedestal collapse in divertor geometry. The profiles from the DⅢ-D H-mode discharge #144382 with fast target heat flux measurements are used as the initial conditions for the simulations. A flux-limited parallel thermal conduction is used with three values of the flux-limiting coefficient α_j, free streaming model with α_j = 1, sheath-limit with α_j = 0.05, and one value in between. The studies show that a 20 times increase in α_j leads to ～6 times increase in the heat flux amplitude to both the inner and outer targets, and the widths of the fluxes are also expanded. The sheath-limit model of flux-limiting coefficient is found to be the most appropriate one, which shows ELM sizes close to the measurements. The evolution of the density profile during the burst of ELMs of DⅢ-D discharge #144382 is simulated, and the collapse in width and depth of n_e are reproduced at different time steps. The growing process of the profiles for the heat flux at divertor targets during the burst of ELMs measured by IRTV (infrared television) is also reproduced by this model. The widths of heat fluxes towards targets are a little narrower, and the peak amplitudes are twice the measurements possibly due to the lack of a model of divertor radiation which can effectively reduce the heat fluxes. The magnetic flutter combined with parallel thermal conduction is found to be able to increase the total heat loss by around 33% since the magnetic flutter terms provide the additional conductive heat transport in the radial direction. The heat flux profile at both the inner and outer targets is obviously broadened by magnetic flutter. The lobe structures near the X-point at LFS are both broadened and elongated due to the magnetic flutter.
机译：为了研究边缘局域模式（ELM）爆发期间瞬态粒子和热通量的分布和演变，基于具有非理想物理效应的Braginskii方程的BOUT ++六场两流体模型用于模拟基座偏滤器几何形状崩溃。来自DⅢ-DH模式放电＃144382的轮廓具有快速的目标热通量测量结果，被用作模拟的初始条件。使用通量受限的平行热传导，其中包含通量限制系数α_j的三个值，α_j= 1的自由流模型，α_j= 0.05的鞘层限制以及介于两者之间的一个值。研究表明，α_j的20倍增加导致内外目标的热通量振幅增加约-6倍，并且通量的宽度也扩大了。发现流量限制系数的鞘极限模型是最合适的模型，它显示了接近测量值的ELM尺寸。模拟了DⅢ-D放电＃144382的ELM爆炸过程中密度分布的演变，并在不同的时间步长上再现了n_e宽度和深度的减小。该模型还再现了IRTV（红外电视）测量的ELM爆发期间，偏滤器目标处热通量分布的增长过程。朝向目标的热通量的宽度稍窄一些，并且峰值幅度是测量值的两倍，这可能是由于缺少可以有效减少热通量的偏滤器辐射模型所致。由于磁颤动项在径向方向上提供了额外的传导性热传递，因此将磁颤动与并行热传导相结合可以使总热量损失增加约33％。内靶和外靶的热通量分布显然会因磁振而变宽。由于磁颤动，在LFS的X点附近的波瓣结构既变宽又变长。

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  • 来源
    《Nuclear fusion》 |2015年第11期|113030.1-113030.15|共15页
  • 作者

    T. Y. Xia; X. Q. Xu;

  • 作者单位

    Chinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, People's Republic of China ,Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;

    Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ELM; heat flux; DⅢD; simulation;

    机译：榆树;热通量DⅢD;模拟;

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