compute ID group_ID pair lj/cut evdwl
The scalar value will be in energy units.
代码示例
compute vdwcalc all pair lj/cut evdwl
variable t equal step
variable VDW_system equal c_vdwcalc
fix vdwo all print 1 "$t ${VDW_system}" file VDW_of_System.dat screen no
run 10
unfix vdwo
批处理脚本
make_group.bsh
for i in {1..39..13}
do
j=$[$i/13+1]
cat > run.in.vdw_xilock_$j <<EOF
# ------------------------------- Initialization Section --------------------
include "system.in.init"
boundary p p p
pair_style lj/cut 2.5
read_data "system_after_nvt_4.data"
# ------------------------------- Settings Section --------------------------
include "system.in.settings"
# -- simulation protocol --
timestep 0.001
velocity all zero linear # <- eliminate drift due to non-zero total momentum
#fix 1 all momentum 1000 linear 1 1 1 # also works
thermo 100
print "---------------------------------------------------------------------------"
print "--- Now Calculate VDW ---"
print "---------------------------------------------------------------------------"
group KB_$j id $i:$[$i+12]
compute vdwcalc_$j KB_$j pair lj/cut evdwl
variable t equal step
variable VDW_system equal c_vdwcalc_$j
fix vdwo all print 1 "\$t \${VDW_system}" file VDW_of_System_$j.dat screen no
run 1
unfix vdwo
EOF
done
说明:
- 玺洛克的体系中有100个KB分子,每个分子13个原子,想先拿其中3个分子做测试,想得到KB分子间结合能的vdw部分。
- 玺洛克的思路是:在当前构象下,先分别计算每个分子的vdw势能,然后计算所有分子总的势能,最后用总的势能减去所有单个分子的vdw势能,即可得到相互作用呢的vdw部分。
- 然而!!!单个KB分子的vdw势能竟然都一样而且跟总的一样??Why??
参考资料
compute ID group1_ID group/group group2_ID
代码示例
计算DRUG和NANOTUBE的VDW
compute vdwlint DRUG group/group NANOTUBE
thermo_style custom step temp c_vdwlin
参考资料
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