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使用MS里的Forcite模拟氯化钠溶液在孔道中扩散的问题,目前正在探索阶段,将孔道模型和溶液用build layer拼接起来后,结构优化后,COMPASSⅡ NVT跑了500ps(因为是探索,所以时间设置比较短)。最后发现水分子向孔道内扩散,但离子位置却几乎没有变化,并没有随着水分子移动,是时间太短还是其他设置问题,请各位老师赐教
Forcite
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Task : Dynamics
Version : 8.0
Build date : Dec 5 2014
Host : DESKTOP-GBE0JMJ
Threads : Parallel 72
Operating system : Windows
Task started : Wed May 04 19:55:16 2022
---- Dynamics parameters ----
Ensemble : NVT
Temperature : 298.00 K
Control method : Nose
Q ratio : 0.0100000
Timestep : 1.00 fs
Number of steps : 500000
Duration : 500 ps
Initial velocities : Random
Random number seed : 1651665316
---- Energy parameters ----
Forcefield : COMPASSII (Version 1.2)
Charges : Forcefield assigned
Electrostatic terms:
Summation method : Ewald
Accuracy : 0.001 kcal/mol
Buffer width : 0.5 A
van der Waals terms:
Summation method : Atom based
Truncation method : Cubic spline
Cutoff distance : 12.5 A
Spline width : 1 A
Long range correction : YES
Buffer width : 0.5 A
---- Thermostat ----
Nose mass parameter, Q mass: 285.316 kcal/mol*ps^2
---- Constraints ----
Position constraints : 4031
---- Dynamics summary ----
Initial Final Average Std. Dev.
------- ----- ------- ---------
Tot. energy (kcal/mol) -45616152.000 -45604040.161 -45603327.219 865.313
Pot. energy (kcal/mol) -45630417.781 -45618296.480 -45617593.000 730.355
Kin. energy (kcal/mol) 14265.781 14256.319 14265.781 273.927
Tot. enthalpy (kcal/mol) -60547393.780 -60532436.864 -60533508.353 1302.110
Temperature (K) 298.000 297.802 298.000 5.722
Pressure (GPa) -258.194 -258.144 -258.175 0.019
Volume (A^3) 401782.715 401782.715 401782.715 0.000
Density (g/cm^3) 0.899 0.899 0.899 0.000
Task terminated : Fri May 06 16:30:38 2022
Total CPU time used by Forcite: 44:03:56 hours (158636s)
Termination status : Normal
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