Numerical Simulation for generation of Carbon Simple Cubic by Dynamic Compression of flyer impact

飞片冲击动态压缩生成碳简单立方体的数值模拟

• 批准号: 11680478
• 负责人: AOKI Takayuki
• 金额: $ 2.3万
• 依托单位: Tokyo Institute of Technology
• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680478/
• 关键词: Carbon Simple Cubic; Diamond; Shock Wave; Tera Pascal Pressure; Laser Ablation; Flyer Accelaration; Shock Impedance; SESAME equation of state; 炭素単純立方格子結晶; 動的圧縮; 数値シミュレーション; 低エントロピー圧縮; 並列計算

This research numerically makes it clear that Carbon Simple Cubic is able to be generated thermodynamically by the dynamic compression of the impact at the collision between the target and flyer which is accelerated by the laser ablation pressure. The Carbon Simple Cubic is expected to appear at the pressure more than 2 Tpa, however it may melt with the temperature of more than several 1000 K. An impact scheme of a slab target and flyer with a layered structure is proposed to achieve low-entropy dynamic compression starting from diamond. The thermodynamic state of diamond during compression is examined using one-dimensional Lagrangian hydrodynamic code and the tabulated equation of state library SESAME. The use of a material with a small shock impedance for the impact interfaces markedly decreases the strength of the primary shock wave. It is found that a gradient of shock impedance across the thickness of the flyer generates small multiple shock waves into the diamond and effective for low-entropy compression. The thermodynamic conditions required for Carbon Simple Cubic and low-entropy dynamic compression is achived.

这项研究在数值上清楚地表明，碳简单立方体能够通过目标与飞行器之间碰撞时的冲击的动态压缩（由激光烧蚀压力加速）而以热力学方式产生。碳简单立方预计会在超过 2 Tpa 的压力下出现，但它可能会在超过数千 K 的温度下熔化。提出了一种板状靶和具有层状结构的飞片的冲击方案，以实现低熵动态压缩从金刚石开始。使用一维拉格朗日流体力学代码和状态库 SESAME 的列表方程检查压缩过程中金刚石的热力学状态。冲击界面使用冲击阻抗小的材料会显着降低主冲击波的强度。研究发现，飞片厚度上的冲击阻抗梯度会在金刚石中产生小的多重冲击波，并且对低熵压缩有效。实现了碳简单立方和低熵动态压缩所需的热力学条件。

项目成果

T. Aoki, S. Nishita, K. Sakurai: "Interpolated Differential Operator (IDO) Scheme and Application to Level Set Method"Comput. Fluid Dynamics Journal. vol.9, No.4. 406-417 (2000)

T. Aoki、S. Nishita、K. Sakurai：“插值微分算子 (IDO) 方案及其在水平集方法中的应用”计算。

二ノ方壽,村松壽晴,青木尊之 他: "原子炉熱流動の微視的シミュレーション"日本原子力学会誌. Vol.42,No.12. 1242-1259 (2000)

二方、村松敏晴、青木隆之等：“核反应堆热流的微观模拟”日本原子能学会杂志第 42 卷，第 1242-1259 期（2000 年）。

K. Kato, T. Aoki, T. Sekine: "Numerical Simulation of carbon Simple Cubic by Dynamic Compression"Jpn. J. Appl. Phys.. vol.40, Part.1, No.2B. 1076-1079 (2001)

K. Kato、T. Aoki、T. Sekine：“动态压缩碳简单立方体的数值模拟”Jpn。

K. Sakurai, T. Aoki: "Implicit IDO (Interpolated Differential Operator) Scheme"Comput. Fluid Dynamics Jounal. vol.8, No. 1. 6-12 (1999)

K. Sakurai、T. Aoki：“隐式 IDO（插值微分算子）方案”计算。

K.Sakurai and T.Aoki: "Implicit IDO (Imterpolated DifferemTial Operator) Scheme"Computational Fluid Dynamics Journal. 8・1. 6-12 (1999)

K. Sakurai 和 T. Aoki：“隐式 IDO（插值差分算子）方案”计算流体动力学杂志 8・1（1999 年）。