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新虫 (小有名气)

[求助] 本人使用lammps软件进行反应模拟时,温度出现飞温现象

本人使用lammps软件reaxff进行反应模拟时,体系温度出现飞温现象,以下是我的in文件:

# ReaxFF potential for MOF

units        real
boundary p p p
atom_style charge


read_data data.txt

mass 1 12.0107     
mass 3 1.00794            
mass 4 15.9994            
mass 5 15.9994         
mass 6 65.38           
mass 7 15.9994         
mass 8 1.00794   

pair_style        reax 6.0 1 1 1.0e-6
pair_coeff        * * ffield.reax 1 1 2 3 3 4 3 2

compute reax all pair reax

variable eb           equal c_reax[1]
variable ea           equal c_reax[2]
variable elp          equal c_reax[3]
variable emol          equal c_reax[4]
variable ev          equal c_reax[5]
variable epen          equal c_reax[6]
variable ecoa          equal c_reax[7]
variable ehb          equal c_reax[8]
variable et          equal c_reax[9]
variable eco          equal c_reax[10]
variable ew          equal c_reax[11]
variable ep          equal c_reax[12]
variable efi          equal c_reax[13]
variable eqeq          equal c_reax[14]

neighbor        2.5 bin
neigh_modify        every 10 delay 0 check no
group 1 type 1 2 3 4 5 6
group 2 type 7 8
#minimize 1.0e-4 1.0e-6 100 1000
velocity all create 300.0 4928459 units box
fix 1 all reax/bonds 1000 bonds.reax
fix 2 all npt temp 300.0 300.0 10.0 iso 1.0 1.0 500.0
dump 1 all custom 1000 trj.1water id type q x y z
#dump_modify 1 scale no
dump_modify 1 sort 1
restart 100 restart1 restart2
thermo 1000
thermo_style custom step cpu temp evdwl ecoul epair etotal press vol enthalpy &
                         v_eb v_ea v_elp v_emol v_ev v_epen v_ecoa v_ehb &
                       v_et v_eco v_ew v_ep v_efi v_eqeq
thermo_modify flush yes
timestep        1
run 2000000

哪位大神指点一下!
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新虫 (小有名气)

2楼2013-12-28 10:09:57
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