International Collaboration for Promoting Complexity Science

促进复杂性科学的国际合作

• 批准号: 08044109
• 负责人: SATO Tetsuya
• 金额: $ 4.42万
• 依托单位: National lnstitute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044109/
• 关键词: plasma; complexity science; self-organaization; structure formation; MHD simulation; particle simualtion; visualizing system; entropy; シミュレーション; 磁気流体ダイナモ; 磁気リコネクション

We have investigated the details of complex phenomena in rich variety of non-equilibrium open systems in collaboration with scientists In Japan, U.S.A., Europe and Asia. The summary of our collaboration research is described in the following.(1) We found from the MHD simulation that a strong magnetic field with a global and ordered structure is spontaneously generated by the MHD dynamo process in a rotating spherica1 shell, and its polarity is suddenly reversed after a long duration.(2) We have studied the merging process of two col1iding spheromaks, and found that a field-reversed configuration with a high pressure is formed through this process.(3) We have studied the physical process of collisionless driven reconnection by means of particle simulation. It should be emphasized that magnetic reconnection evolves in two steps due to two kinetic effects and the ions anomalously heated by the action of an electrostatic field.(4) Particle simulation has revealed that a super ion-acoustic double layr with a large potential gap is generated after the generation and disappearance of a norma1 ion-acoustic double layr if there exists an entropy expulsion process in an open system.(5) We have developed a particle simulation code for dust grains with dynamically charging processes, and clarified the condition under which the coagulation of dust grains takes place.(6) We have investigated the structure formation process at a molecular level by carrying out a molecular dynamics simulation of polymer chains . It is emphasized that the structure formation of polymer chains proceeds in a few steps.(7) We have developed three-dimensiona1 interactive data visualizing system "CompleXcope", which is a new application of the virtual reality system, as a powerful tool to comprehend complex phenomena.

我们与日本、美国、欧洲和亚洲的科学家合作，研究了丰富多样的非平衡开放系统中复杂现象的细节。我们的合作研究总结如下：(1)通过MHD模拟发现，旋转球壳中的MHD发电机过程自发产生了一个具有全局有序结构的强磁场，其极性为(2)我们研究了两个碰撞球体的合并过程，发现通过这个过程形成了一个高压的场反转构型。(3)我们研究了通过粒子模拟实现无碰撞驱动重连接的物理过程。需要强调的是，由于两种动力学效应和静电场作用下离子异常加热，磁重联分两步演化。(4)粒子模拟揭示了具有大势隙的超级离子声双层如果开放系统中存在熵驱逐过程，则在正常离子声双层产生和消失后产生。（5）我们开发了具有动态充电过程的尘埃颗粒的粒子模拟代码，并且阐明了粉尘颗粒发生凝聚的条件。(6)通过对聚合物链进行分子动力学模拟，研究了分子水平上的结构形成过程。强调聚合物链的结构形成是通过几个步骤进行的。(7)我们开发了三维交互式数据可视化系统“CompleXcope”，这是虚拟现实系统的一个新应用，作为理解数据的有力工具。复杂的现象。

项目成果

A.Kageyama: "Dipole field generation by an MHD dynamo" Plasma Phys.Contr.Fusion. 39. A83-A91 (1997)

A.Kageyama：“MHD 发电机产生偶极场”Plasma Phys.Contr.Fusion。

T.Todo, et al.: "Liner and Nonlinear Particle-Magnetohydrodynamic Simulations of the Toroidal Alfven Eigenmode" Phys.Plasmas. (in press). (1998)

T.Todo 等人：“环形阿尔文本征模的线性和非线性粒子磁流体动力学模拟”Phys.Plasmas。

S.Kida, et al.: "Periodic reversals of magnetic field generated by thermal convection in a rotating spherical shell" J.Phys.Soc.Jpn.66. 2194-2201 (1997)

S.Kida 等人：“旋转球壳中热对流产生的磁场周期性反转”J.Phys.Soc.Jpn.66。

A.Kageyama, et al.: "Generation mechanism of a dipole field by a magnetohydrodynamic dynamo" Phys.Rev.E. 55. 4617-4626 (1997)

A.Kageyama 等人：“磁流体动力发电机产生偶极场的机制”Phys.Rev.E。

K.Nishimura, et al.: "Tilt stabilization by cycling ions crossing magnetic separatrix in a field-reversed configuration" Phys.Plasmas. 4. 4035-4042 (1997)

K.Nishimura 等人：“通过在场反转配置中循环离子穿过磁性分界线实现倾斜稳定”Phys.Plasmas。