MD calculation water on Pt

Sergey Doronin sedo... at gmail.com
Thu Nov 12 19:56:49 UTC 2015



Hi, dear colleagues

 

Last weeks I started MD calculation of Pt+H2O system. Water was presented 
by SPC model, Pt-H2O described by Siepmann-Sprik type potential (parameters 
of potential were taken from J.I. Siepmann and M.Sprik // J.Chem.Phys. Vol. 
102, No. 1, 1995).

 

Unfortunately all calculations are terminated as:

 

(file *Pt111_1586H2O_Test1*)

*ENERGY| Total FORCE_EVAL ( FIST ) energy (a.u.):            
-31.736442138935644*

 

 

* Centre of mass motion (COM):                            x =       
-0.0000001751*

*                                                         y =        
0.0000000386*

*                                                         z =       
-0.0000002641*

 

* ********************************************************************************

* ENSEMBLE TYPE                
=                                              NVT*

* STEP NUMBER                  
=                                             4210*

* TIME [fs]                    =                                       
421.000000*

* CONSERVED QUANTITY [hartree] =                               
0.132931078387E+04*

 

*                                              INSTANTANEOUS             
AVERAGES*

* CPU TIME [s]                 =                        
0.97                 1.01*

* ENERGY DRIFT PER ATOM [K]    =          0.746520229520E+05   
0.483172888277E+05*

* POTENTIAL ENERGY[hartree]    =         -0.317364421389E+02  
-0.305625006633E+02*

* KINETIC ENERGY [hartree]     =          0.294647664771E+01   
0.450202835322E+01*

* TEMPERATURE [K]              =                     195.611              
298.881*

* ********************************************************************************

 

* MM DIPOLE [BERRY PHASE](A.U.)|                  -5.474236  -7.277890 
-24.581328*

* MM DIPOLE [BERRY PHASE](Debye)|                -13.914119 -18.498550 
-62.479498*

* MM DIPOLE [BERRY PHASE] DERIVATIVE(A.U.)|       -0.011981  -0.010334   
0.009710*

 

* ENERGY| Total FORCE_EVAL ( FIST ) energy (a.u.):           
8772.964220420968559*

 

 

* Centre of mass motion (COM):                            x =       
-0.0000010184*

*                                                         y =        
0.0000002238*

*                                                         z =       
-0.0000015332*

 

 

 

* ********************************************************

* *** ERROR in siep_Phi_ij (MODULE manybody_siepmann) ****

* ********************************************************

 

* *** Error in Siepmann-Sprik part: too many H atoms ****

 

* *** Program stopped at line number 338 of MODULE manybody_siepmann ****


or sometimes (file *Pt111_1586H2O_Test2*) terminated as

 

*Centre of mass motion (COM):                            x =       
-0.0000000528*

*                                                         y =       
-0.0000000109*

*                                                         z =       
-0.0000001862*

* MM DIPOLE [BERRY PHASE](A.U.)|                  -6.717544   2.821496  
-3.847367*

* MM DIPOLE [BERRY PHASE](Debye)|                -17.074293   7.171526  
-9.779030*

* MM DIPOLE [BERRY PHASE] DERIVATIVE(A.U.)|       -0.002798  -0.008723   
0.005970*

 

* ENERGY| Total FORCE_EVAL ( FIST ) energy (a.u.):            
-31.096110069961611*

 

 

* Centre of mass motion (COM):                            x =       
-0.0000000505*

*                                                         y =       
-0.0000000105*

*                                                         z =       
-0.0000001776*

* MM DIPOLE [BERRY PHASE](A.U.)|                  -6.729504   2.834566  
-3.852281*

* MM DIPOLE [BERRY PHASE](Debye)|                -17.104691   7.204748  
-9.791520*

* MM DIPOLE [BERRY PHASE] DERIVATIVE(A.U.)|       -0.002638  -0.008331   
0.005670*

 

* ENERGY| Total FORCE_EVAL ( FIST ) energy (a.u.):       
96420902.412601232528687*

 

 

* ***********************************************************************

* ***********************************************************************

* *** 22:43:43 ERRORL3 in thermostat_utils:communication_thermo_low1 ****

* *** processor 0  :: err=-300 condition FAILED at line 1877         ****

* ***********************************************************************

* ***********************************************************************

 

 

I’ve varied the basic parameters to solve the problem: time steps, 
temperature, type and parameters of thermostat, Pt-O potential in &genpot 
section and etc. But all manipulation doesn’t give anything. Anyway, each 
task has a jump of energy at last iteration. A network also doesn’t have 
any information.

 

Can anyone please help me to solve this problem? Maybe someone work with 
Siepmann potential?
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