标题: lammps做周期性体系电场模拟参数设置(求助gfile) [打印本页] 作者Author: Wolf123 时间: 2025-11-21 10:46 标题: lammps做周期性体系电场模拟参数设置(求助gfile) 我在周期性体系中加电场时使用了fix ID group-ID qeq/rel/reaxff Nevery cutlo cuthi tolerance params gfile args,具体设置为
pair_style reaxff lmp_control
pair_coeff * * ffield.reax.GR-RDX-2021 Cg H C C C
fix 1 all qeq/rel/reaxff 1 0.0 10.0 1.0e-6 reaxff exp.qeqr
fix 2 all reaxff/species 1 20 1000 species.txt element Cg H C C C
Lammps官网给出的gfile来自THEORY AND APPLICATIONS OF FLUCTUATING–CHARGE MODELS,因此我将exp.qeqr设置如下
# An example gfile. Exponents are taken from Table 2.2 of Chen, J. (2009).
# Theory and applications of fluctuating-charge models.
# The units of the exponents are 1 / (Bohr radius)^2 .
1 0.2069 # Cg
2 0.5434 # H
3 0.2069 # C
4 0.2069 # C
5 0.2069 # C
我目前直接将其中的参数用到了计算中,这样设置是否合理呢?
作者Author: Wolf123 时间: 2025-11-21 11:11
fix ID group-ID qtpie/reaxff Nevery cutlo cuthi tolerance params gfile args也可以用于外加电场的模拟,有效电负性的计算方法存在差异。Lammps官网给出的 gfile 示例如下
# An example gfile. Exponents are taken from Table 2.2 of Chen, J. (2009).
# Theory and applications of fluctuating-charge models.
# The units of the exponents are 1 / (Bohr radius)^2 .
1 0.2240 # O
2 0.5434 # H