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周三啊

铁虫 (小有名气)

[求助] Mismatched compute in variable formula 已有1人参与

各位大佬好,我在使用ILP势计算两层原子之间的势能,官网上说势能计算可以分为排斥和吸引两部分,并且可以单独访问,语句如下

This pair style tallies a breakdown of the total interlayer potential energy into sub-categories, which can be accessed via the compute pair command as a vector of values of length 2. The 2 values correspond to the following sub-categories:
E_vdW = vdW (attractive) energy
E_Rep = Repulsive energy
To print these quantities to the log file (with descriptive column headings) the following commands could be included in an input script:

compute 0 all pair ilp/graphene/hbn
variable Evdw  equal c_0[1]
variable Erep  equal c_0[2]
thermo_style custom step temp epair v_Erep v_Evdw


但是我在计算时却出现ERROR: Variable ILP: Mismatched compute in variable formula (../variable.cpp:1580)的错误。希望大家可以解答一下,谢谢!!!!!!




我的脚本如下:
# Initialization
units           metal
boundary        p p p
atom_style      full
processors      * * 1     # domain decomposition over x and y

# System and atom definition
# we use 2 atom types so that inter- and intra-layer
# interactions can be specified separately
# read lammps data file
read_data       3.2_.data
mass            1 12.0107   # carbon mass (g/mole) | membrane
mass            2 12.0107   # carbon mass (g/mole) | adsorbate
# Separate atom groups
group membrane  type 1
group adsorbate type 2

######################## Potential defition ########################
pair_style  hybrid/overlay  rebo  ilp/graphene/hbn 16.0
####################################################################
pair_coeff  * * rebo               CH.airebo      NULL C  # chemical
pair_coeff  * * ilp/graphene/hbn   BNCH.ILP    C    C  # long range
####################################################################
# Neighbor update settings
neighbor        2.0 bin
neigh_modify    every 1
neigh_modify    delay 0
neigh_modify    check yes

# calculate the COM
variable        adsxcom equal xcm(adsorbate,x)
variable        adsycom equal xcm(adsorbate,y)
variable        adszcom equal xcm(adsorbate,z)
variable        adsvxcom equal vcm(adsorbate,x)
variable        adsvycom equal vcm(adsorbate,y)
variable        adsvzcom equal vcm(adsorbate,z)

#### Simulation settings ####
timestep  0.001
velocity  adsorbate create 300.0 12345
fix       subf membrane setforce 0.0 0.0 0.0
fix       thermostat all nve

compute   0 all pair rebo
compute   1 all pair ilp/graphene/hbn
variable  REBO     equal c_0
variable  ILP      equal c_1
variable Evdw  equal c_1[1]
variable Erep  equal c_1[2]


############################

# Output
thermo          100
thermo_style    custom step etotal pe ke v_REBO v_ILP v_Erep v_Evdw temp v_adsxcom v_adsycom v_adszcom v_adsvxcom v_adsvycom v_adsvzcom
thermo_modify   line one format float %.10f
thermo_modify   flush yes norm no lost warn

dump            1 all custom 100 traj.lammpstrj id mol type xu yu zu
dump_modify     1 format line "%7d %3d %3d %15.10g %15.10g %15.10g" flush yes

###### Run molecular dynamics ######
run 1000
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zhizhuceyici

金虫 (初入文坛)

【答案】应助回帖

你好 我也遇到了一样的问题
我感觉应该是因为使用了新的ouyang的势 因此ilp/graphene/hbn的计算只是一个标量而非数组
早期的example里面的例子和manual一样,分成了两项
但是我目前下载的lammps里面的example的例子已经只计算一项
compute   2 all pair ilp/graphene/hbn
variable  EILP     equal c_2
我们不计较麦穗的饱满是在哪一天。
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