[CP2K-user] [CP2K:16332] PBC problem

kj43 tem ktem395 at gmail.com
Fri Dec 3 09:39:57 UTC 2021


Greetings, I have recently started using cp2k and I'm a beginner. I'm 
writing to you because I need help with a molecular dynamics calculation. 
My system consists of a silver surface that interacts with an aqueous 
solution. I applied the PBCs only along the X and Y axes, but not along Z 
(in that Z direction I have the solution that interacts with the surface). 
The silver surface is parallel to the XY plane I set in the & POISSON 
section: 
POISSON_SOLVER ANALYTIC Unfortunately, however, it happens that the bonds 
of some water molecules tend to break when they reach the edge of the 
simulation box along Z, as if the atoms interacted with the image of my 
surface, which is located along Z. I tried to change the algorithm to 
POISSON_SOLVER but got the same results. At this point, with the VMD 
software I entered the size of the simulation box that I entered in the 
Cp2k input and I visualized the system image along z. I observed (as you 
can see in the following image) that the hydrogen atoms tend to collapse 
towards the silver atoms of the image along z (this however should not 
happen because in PERIODIC I have set only the X and Y axes). These are the 
dimensions of the simulation box:

&CELL ABC 16.36 16.36 16.78 PERIODIC XY &END CELL

In the following images, however, we can see how the atoms that are subject 
to breaking of the bonds are "attracted" by atoms of the image surface 
along z (which should not exist, however).

In the following image there is the initial situation:
[image: 01.png]

The following image shows the breaking of some chemical bonds: (this occurs 
after a few thousand of molecular dynamics steps)
[image: 02.png]

Finally, in this image I show the image of the system along Z, and it is 
evident that the hydrogen atoms converge towards a silver atom in the image: [image: 
03.png] 

Here is my input: (I apologize for any mistakes but I am learning and I may 
have made many mistakes)

&FORCE_EVAL
  METHOD QUICKSTEP
  &DFT
    &QS
      METHOD xTB
      &xTB
         &PARAMETER
            DISPERSION_PARAMETER_FILE dftd3.dat
         &END PARAMETER
         DO_EWALD T
         CHECK_ATOMIC_CHARGES F
         STO_NG 6
      &END xTB
    &END QS
    &POISSON
      PERIODIC XY
      POISSON_SOLVER IMPLICIT
      &EWALD
        EWALD_TYPE SPME
      &END EWALD
    &END POISSON
    &SCF
      SCF_GUESS ATOMIC
      MAX_SCF  250
      EPS_SCF 1.e-6
      &OT
        MINIMIZER CG
        PRECONDITIONER FULL_ALL
        ENERGY_GAP 0.01
      &END
      &OUTER_SCF
        EPS_SCF 1.e-6
        MAX_SCF 250
      &END
    &END SCF
  &END DFT
  &SUBSYS
    &CELL
      ABC 16.36 16.36 16.78 
      PERIODIC XY
    &END CELL
    &COORD
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O    3.7403870674632939E-01    6.6823363893228098E+00    
8.7743942729299942E+00
H   -3.5946164548139974E-02    5.8034469424041015E+00    
9.0819048112506042E+00
H    7.1107871694885096E+00    2.9957850379400530E+00    
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H    7.9043192449986526E+00    1.7695235559647979E+00    
1.0966605596579099E+01
    &END COORD
  &END SUBSYS
&END FORCE_EVAL
&MOTION
  &CONSTRAINT
    &FIXED_ATOMS
      COMPONENTS_TO_FIX XYZ
      LIST 1..128
    &END FIXED_ATOMS
  &END CONSTRAINT
  &MD
    ENSEMBLE NVE
    STEPS 10000
    TIMESTEP 0.1
    TEMPERATURE 300.0
    TEMP_TOL 50.0
  &END MD
&END MOTION  
&GLOBAL
  PROJECT testAg_surf
  RUN_TYPE MD 
  PRINT_LEVEL LOW
&END GLOBAL





Thank you very much for your help.  

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