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摘要: 与一般流体力学计算中将流体力学方程组进行空间离散、再进行时间推进计算不同，采用Hayes提出的流场反演方法，将流体力学方程组进行时间离散，然后将VISAR测量得到的样品后自由面速度历史作为输入数据，再进行空间的反演计算。与一般流体力学计算进行了比较，并与柏劲松设计的Pillow飞片撞击铜样品实验的计算结果作了比较，该方法反演出的样品加载面处的压力历史与其计算结果基本一致，通过参数优化方法多次进行反积分计算调试出的等熵压缩线具有较高的可信度。
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关键词:
- 准等熵压缩 /
- 流场反演方法（反积分方法） /
- Lagrange分析
Abstract: The govering equation of hydrodynamics are discreted over time. Using a VISAR trace as initial conditions, they are numerically integrated backwards in space. A detail analysis shows good precision has gotten. The traced pressure load history at load surface is consistent with Bai's results. The deduced stress-strain behavior of copper agrees well with the isentropic used in Bai's code.-
Key words:
- isentropic compression /
- backward integration method /
- Lagrange analysis
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Hua J S, Jing F Q, Gong Z Z, et al. Study of Numerical Simulation for Qasi-Isentropic Compression [J]. Chinese Journal of High Pressure Physics, 2000, 14(3): 195-202. (in Chinese) 华劲松, 经福谦, 龚自正, 等. 准等熵压缩的数值模拟研究 [J]. 高压物理学报, 2000, 14(3): 195-202. Barker L M. High-Pressure Quasi-Isentropic Impact Experiments [A]//Asay J R, Graham R A, Straub G K. Shock Waves in Condensed Matter-1983 [C]. Amsterdam: North-Holland, 1984: 217-224. Edwards J, Lorenz K T, Remington B A, et al. Laser-Driven Plasma Loader for Shockless Compression and Accelerationof Samples in the Solid State [J]. Phys Rev Lett, 2004, 92(7): 075002. Hall C A. Isentropic Compression Experiments on the Sandia Z Accelerator [J]. Phys Plasmas, 2000, 7(5): 2069 - 2075. Hayes D. Backward Integration of the Equations of Motion to Correct for Free Surface Perturbaritz [R]. Sand2001-1440, Sandia National Laboratories, 2001. Hayes D, Vorthman J, FritJ Z. Backward Integration of a Spall VISAR Record to the Spall Plane [R]. LA-13830-MS, 2001. -
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