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.

通过数值计算表明，在激光烧蚀压力的加速下，靶片与飞片碰撞时的冲击被动态压缩，从而产生简单立方碳。简单立方碳预计在超过2tpa的压力下出现，但它可能在超过1000 K的温度下熔化。为了实现从菱形开始的低熵动态压缩，提出了一种分层结构的板坯靶与飞片的冲击方案。利用一维拉格朗日流体力学程序和状态库SESAME的表列方程，研究了金刚石在压缩过程中的热力学状态。采用冲击阻抗小的材料作为冲击界面，会显著降低初级激波的强度。研究发现，沿飞片厚度的激波阻抗梯度可以产生小的多次激波进入金刚石，并且可以有效地进行低熵压缩。得到了简单立方碳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.Kato,T.Aoki,T.Sekine: "A Numerical Simulation of State of Compressed Diamond"The 8^<th>NIRIM International Symposium on Advanced Materials(3月4日〜8日つくば). (発表予定). (2001)

K.Kato、T.Aoki、T.Sekine：“压缩金刚石状态的数值模拟”第 8 届 NIRIM 国际先进材料研讨会（3 月 4 日至 8 日筑波）（预定演讲）。

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。