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callen123

金虫 (小有名气)

[求助] 求助LAMMPS混合势函数设置 已有1人参与

我的体系是水溶液含ZnOTF2(Zn,C,H,O,N,S)分子的混合体系。

想用reaxff势函数描述ZnOTF2分子的CHONS元素,用文献报告的参数描述Zn2+,再用SPC描述H2O分子。但是运行报如下错误,感觉是pair_style错了:
-------------
LAMMPS (23 Jun 2022 - Update 4)
OMP_NUM_THREADS environment is not set. Defaulting to 1 thread. (src/comm.cpp:98)
  using 1 OpenMP thread(s) per MPI task
Reading data file ...
  orthogonal box = (0 0 0) to (20 20 20)
  4 by 4 by 4 MPI processor grid
  reading atoms ...
  722 atoms
  read_data CPU = 0.074 seconds
ERROR: Illegal pair_style command (src/REAXFF/pair_reaxff.cpp:187)
Last command: pair_style hybrid/overlay reaxff lj/cut/coul/long 9.0
-------------

输入in文件主要部分如下:
# Initialization
units real
dimension 3
boundary p p p
atom_style charge

# Atom definition
read_data ZnOTF2_H2O.data

# Force field settings
pair_style hybrid/overlay reaxff lj/cut/coul/long 9.0

# Mass and atom types
mass 1 32.065        # S
mass 2 15.9994       # O
mass 3 12.0107       # C
mass 4 1.00794       # H
mass 5 65.409        # Zn
mass 6 1.00794       # H
mass 7 15.9994       # O
# Define other masses and atom types as needed
set type 1 charge 0
set type 2 charge 0
set type 3 charge 0
set type 4 charge 0
set type 5 charge 0
set type 6 charge 0.4238
set type 7 charge -0.8476

# Force field parameters for molecule
pair_coeff * * reaxff_JPCA S O C H
fix reax all qeq/reaxff 1 0.0 10.0 1.0e-6 reaxff
# Define other pair coefficients as needed

# Force field parameters for Zn2+
pair_coeff 5 5 lj/cut/coul/long 0.046 1.568
pair_coeff 5 2 lj/cut/coul/long 0.046 2.367
pair_coeff 5 6 lj/cut/coul/long 0.046 0.0         # Oxygen-Zinc interactions
pair_coeff 5 7 lj/cut/coul/long 0.046 2.367       # Hydrogen-Zinc interactions

# SPC Water model
pair_coeff 7 7 lj/cut/coul/long 0.1553 3.166               #8=Ow,7=Hw
pair_coeff 7 6 lj/cut/coul/long 0.0 0.0
pair_coeff 6 6 lj/cut/coul/long 0.0 0.0
pair_coeff 6 1 lj/cut/coul/long 0.0 0.0
pair_coeff 6 2 lj/cut/coul/long 0.0 0.0
pair_coeff 6 3 lj/cut/coul/long 0.0 0.0
pair_coeff 6 4 lj/cut/coul/long 0.0 0.0
pair_coeff 7 1 lj/cut/coul/long 0.0 0.0
pair_coeff 7 2 lj/cut/coul/long 0.0 0.0
pair_coeff 7 3 lj/cut/coul/long 0.0 0.0
pair_coeff 7 4 lj/cut/coul/long 0.0 0.0

请大神指点,非常感谢!
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xixijack

铁虫 (初入文坛)

引用回帖:
3脗楼: Originally posted by xixijack at 2023-08-30 00:52:30
脛茫鲁垄脢脭脪禄脧脗掳脩pair_coeff i j 脠脙 i <=j 脢脭脢脭

Also, you have 7 types, you can try assign NULL for type 5 6 7 for reaxff
4楼2023-08-30 00:56:39
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xixijack

铁虫 (初入文坛)

【答案】应助回帖

你尝试一下把pair_coeff i j 让 i <=j 试试
3楼2023-08-30 00:52:30
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