Li Hao, Xu Bo, Yan Zixiang, Zhang Xinyu, Mo Chongjie, Xue Quanxi, Xiao Xiazi, Liu Hao
Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China.
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Entropy (Basel). 2024 Aug 25;26(9):724. doi: 10.3390/e26090724.
The non-equilibrium characteristics during the shock relaxation process hold a foundational position in various fields. In contrast to the propagation of a single shock wave, the collision process of two shock waves exhibits distinct non-equilibrium features. Employing non-equilibrium molecular dynamics, we simulated the collision of ultra-strong shock waves in a classical gas system, investigating the relationship between equilibrium relaxation time and shock intensity. Tracking the spatial migration of microscopic particles in the shock collision region during the relaxation process, we observed a significant contribution of particle migration to the average energy changes during relaxation. The discussion on particle migration provides a valuable new perspective for understanding the microscopic mechanisms of the relaxation process.
冲击弛豫过程中的非平衡特性在各个领域都占据着基础性地位。与单个激波的传播不同，两个激波的碰撞过程呈现出独特的非平衡特征。利用非平衡分子动力学，我们在经典气体系统中模拟了超强激波的碰撞，研究了平衡弛豫时间与激波强度之间的关系。在弛豫过程中跟踪激波碰撞区域内微观粒子的空间迁移，我们观察到粒子迁移对弛豫过程中的平均能量变化有显著贡献。关于粒子迁移的讨论为理解弛豫过程的微观机制提供了一个有价值的新视角。
