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Artificial boundary conditions for atomic simulations of face-centered-cubic lattice |
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| Authors: | Ming Fang Shaoqiang Tang Zhihui Li Xianming Wang |
| Affiliation: | 1. CAPT and LTCS, College of Engineering, Peking University, Beijing, 100871, China 2. Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, P.O. Box 211, Mianyang, 621000, China 3. HEDPS, CAPT and LTCS, College of Engineering, Peking University, Beijing, 100871, China 4. Center for Combustion Energy and Department of Thermal Engineering, Tsinghua University, Beijing, 100084, China |
| Abstract: | We design a class of matching boundary conditions for atomic simulations of the face-centered-cubic lattice. Such a condition takes the form of a linear constraint for atoms near the boundary. A normal matching boundary condition is obtained by matching the dispersion relation in the long wave limit. A two-angle matching boundary condition is constructed through operator multiplication with the help of apparent wave propagation. The edge atoms and the corner atoms are treated in a consistent manner. Reflection coefficient analysis and wave-packet tests verify the effectiveness of the proposed boundary conditions for general incidence, not limited to long waves. The treatment is local in both space and time, yielding negligible additional numerical cost. Vector wave formulation is also presented, and applied to nanoindentation simulations. |
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