Towards a Unified Magnetohydrodynamic Theory Describing the Formation of Energy-Transport Barriers in Plasma Turbulence

建立描述等离子体湍流中能量传输势垒形成的统一磁流体动力学理论

基本信息

  • 批准号:
    11680496
  • 负责人:
  • 金额:
    $ 2.37万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1999
  • 资助国家:
    日本
  • 起止时间:
    1999 至 2000
  • 项目状态:
    已结题

项目摘要

In this study we clarified that plasma rotation, helicity, cross helicity, and electric field are closely related to the magnetic-field generation and the suppression of turbulent transports in magnetohydrodynamic plasmas. The findings are summarized as follows :(1) It was shown that large-scale magnetic structures can be generated and sustained in turbulence by a combination of plasma-rotation and cross-helicity (velocity/magnetic-field correlation) effects. This is a manifestation of the turbulent dynamo and suppression of turbulent transport.A turbulence model that can describe the field-generation and turbulence-suppression was constructed.(2) The magnetohydrodynamic mechanism of electric-field transport suppression, with special reference to tokamak's reversed-shear confinement, was presented. The mechanism of plasmarotation generation due to the combination of electric-field-curvature and cross-helicity effects was also presented for the first time theoretically. The validity of the mechanisms was confirmed through a numerical simulation of a cylindrical plasma.(3) Generation and sustainment mechanisms or dynamos of global magnetic field in plasma turbulence were presented with special emphasis of the combination of the helicity (an index representing helcal properties of velocity and magnetic-field structures) and cross-helicity effects. These dynamos were applied to phenomena such as the geomagnetism, solar polarity reversal, and collimation of astrophysical jets, and shown to successfully describe characteristics of these phenomena.(4) Turbulence theories and modeling of fluids and plasmas were reviewed from the viewpoint of inhomogeneities of fields and plasma parameters. The similarity and dissimilarity between the theoretical methods analysing fluid and plasma turbulence were shown.
在这项研究中,我们澄清了等离子体的旋转,螺旋度,交叉螺旋度,和电场是密切相关的磁场产生和抑制的湍流输运磁流体动力学等离子体。主要研究结果如下:(1)等离子体旋转和交叉螺旋度(速度/磁场关联)效应的共同作用可以在湍流中产生和维持大尺度磁结构。建立了一个能描述湍流场产生和湍流输运抑制的湍流模型。(2)针对托卡马克的反向剪切约束,提出了电场输运抑制的磁流体力学机制。首次从理论上提出了电场曲率和交叉螺旋度效应共同作用的等离子体旋转产生机制。通过对圆柱形等离子体的数值模拟,证实了该机制的有效性。(3)本文提出了等离子体湍流中全局磁场的产生和维持机制或发电机,特别强调了螺旋度(代表速度和磁场结构的螺旋特性的指标)和交叉螺旋度效应的结合。这些发电机被应用于现象,如地磁,太阳极性反转,和天体物理喷流的准直,并成功地描述了这些现象的特点。(4)从场和等离子体参数的不均匀性出发,综述了流体和等离子体的湍流理论和湍流模型。指出了流体和等离子体湍流理论分析方法的相似性和不同点。

项目成果

期刊论文数量(12)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hamba,Fujihiro: "Effects of pressure fluctuations on turbulence growth in compressible homogeneous shear flow"Physics of Fluids. 11・6. 1623-1635 (1999)
Hamba、Fujihiro:“压力波动对可压缩均匀剪切流中湍流增长的影响”流体物理学 11・6(1999)。
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  • 影响因子:
    0
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  • 通讯作者:
Yokoi,Nobumitsu: "Magnetic-field generation and turbulence suppression due to cross-helicity effects"Physics of Fluids. 11・8. 2307-2316 (1999)
横井信光:“交叉螺旋效应引起的磁场产生和湍流抑制”《流体物理学》11・8(1999)。
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    0
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A.Yoshizawa, S.-I.Itoh, K.Itoh, and N.Yokoi: "Turbulence theories and modelling of fluids and plasmas"Plasma Physics and Controlled Fusion. 43-3. R1-R144 (2001)
A.Yoshizawa、S.-I.Itoh、K.Itoh 和 N.Yokoi:“流体和等离子体的湍流理论和建模”等离子体物理和受控聚变。
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  • 期刊:
  • 影响因子:
    0
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Yoshizawa,Akira: "Mean field theory interpretation of solar polarity reversal"The Astrophysical Journal. 537・2. 1039-1053 (2000)
吉泽晃:“太阳极性反转的平均场理论解释”《天体物理学杂志》537・2(2000)。
  • DOI:
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  • 期刊:
  • 影响因子:
    0
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Yoshizawa,Akira: "Magnetohydrodynamic mechanisms of electric-field transport suppression and plasma-rotation generation, with special reference to tokamak's reversed-shear confinement"Physics of Plasmas. 6・8. 3194-3206 (1999)
吉泽晃:“电场输运抑制和等离子体旋转产生的磁流体动力学机制,特别是托卡马克的反向剪切限制”,《等离子体物理学》6・8(1999)。
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    0
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YOKOI Nobumitsu其他文献

YOKOI Nobumitsu的其他文献

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{{ truncateString('YOKOI Nobumitsu', 18)}}的其他基金

A self-consistent turbulence model for the long-term solar-activity cycle
长期太阳活动周期的自洽湍流模型
  • 批准号:
    24540228
  • 财政年份:
    2012
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Turbulent swirling flows viewed from the notion of helicity
从螺旋度的概念看湍流旋流
  • 批准号:
    17540349
  • 财政年份:
    2005
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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