并行原子-连续统（CAC）方法及其在声子输运中的应用
Recent Progress in the Concurrent Atomistic-Continuum (CAC) Method and its Application in Phonon Transport
摘要：
本文介绍了并行原子连续统（CAC）方法在声子输运的粗粒度空间和时间分辨原子模拟中的最新进展。应用实例，包括热脉冲传播通过晶界和相界面，以及声子和移动位错之间的相互作用，提供证明CAC的能力。模拟结果提供了直观的证据，并揭示了各种现象的基本物理，包括：声子聚焦，波的干扰，位错阻力，界面Kapitza电阻所造成的准弹道声子输运等一种新的方法来量化通量瞬态输运过程中也介绍。
英文摘要：
This work presents recent the progress in the development of the Concurrent Atomistic-Continuum (CAC) method for coarse-grained space- and time-resolved atomistic simulations of phonon transport. Application examples, including heat pulses propagating across grain boundaries and phase interfaces, as well as the interactions between phonons and moving dislocations, are provided to demonstrate the capabilities of CAC. The simulation results provide visual evidence and reveal the underlying physics of a variety of phenomena including: phonon focusing, wave interference, dislocation drag, interfacial Kapitza resistance caused by quasi-ballistic phonon transport, etc. A new method to quantify fluxes in transient transport processes is also introduced.
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