Dear users and developers of CP2K,<div><br></div><div>I tried starting the simulation of the crystal structure using cp2k. To do that, I used an input file:</div><div><br></div><div>&GLOBAL<br> PROJECT crys_pbc_opt<br> RUN_TYPE GEO_OPT <br> PRINT_LEVEL MEDIUM<br> EXTENDED_FFT_LENGTHS .TRUE.<br>&END GLOBAL<br><br>&MOTION <br>&GEO_OPT<br> <br> ! KEEP_SPACE_GROUP .TRUE.<br> OPTIMIZER LBFGS <br><br>&END GEO_OPT<br>&END MOTION <br><br>&FORCE_EVAL<br> METHOD Quickstep ! Electronic structure method (DFT,...)<br> &DFT<br> BASIS_SET_FILE_NAME BASIS_MOLOPT<br> POTENTIAL_FILE_NAME POTENTIAL<br><br> &POISSON ! Solver requested for non periodic calculations<br> PERIODIC XYZ<br> &END POISSON<br> &SCF ! Parameters controlling the convergence of the scf. This section should not be changed. <br> SCF_GUESS ATOMIC<br> EPS_SCF 1.0E-6<br> MAX_SCF 300<br> &END SCF<br> &XC ! Parameters needed to compute the electronic exchange potential <br> &XC_FUNCTIONAL PBE<br> &END XC_FUNCTIONAL<br> &END XC<br> &END DFT<br><br> &SUBSYS<br> &CELL<br> CELL_FILE_FORMAT CIF<br> ABC 9.2568 140.3208 18.9674<br> PERIODIC XYZ<br> &END CELL<br> &TOPOLOGY ! Section used to center the atomic coordinates in the given box. Useful for big molecules<br> COORD_FILE_FORMAT cif<br> COORD_FILE_NAME ./cell.cif<br> ! &CENTER_COORDINATES<br> ! CENTER_POINT 5. 5. 5.<br> ! &END<br> &END<br> &KIND H<br> ELEMENT H<br> BASIS_SET DZVP-MOLOPT-GTH<br> POTENTIAL GTH-PBE-q1<br> &END KIND<br> &KIND O<br> ELEMENT O<br> BASIS_SET DZVP-MOLOPT-GTH<br> POTENTIAL GTH-PBE-q6<br> &END KIND<br> &KIND C<br> ELEMENT C<br> BASIS_SET DZVP-MOLOPT-GTH<br> POTENTIAL GTH-PBE-q4<br> &END KIND<br> &KIND N<br> ELEMENT N<br> BASIS_SET DZVP-MOLOPT-GTH<br> POTENTIAL GTH-PBE-q5<br> &END KIND<br> &END SUBSYS<br>&END FORCE_EVAL<br></div><div><br></div><div> ##############################################<br><br></div><div>The simulation starts, but only one step of SCF wavefunction optimization is passed, and then the calculation stops without errors. </div><div><br></div><div> Re-scaling the density matrix to get the right number of electrons<br> # Electrons Trace(P) Scaling factor<br> 8576 8575.456 1.000<br><br><br> SCF WAVEFUNCTION OPTIMIZATION<br><br> Step Update method Time Convergence Total energy Change<br> ------------------------------------------------------------------------------<br> 1 P_Mix/Diag. 0.40E+00 ****** 1.37713667 -13502.7304100109 -1.35E+04<br></div><div><br></div><div>How do you think, what happens? How could I change the input file to solve this problem?</div><div><br></div><div>Best regards, </div><div>Victor</div><div><br></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">суббота, 20 августа 2022 г. в 17:41:05 UTC+3, Victor Nazarychev: <br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><p>Dear users and developers of CP2K,<br><br>I am a new user of CP2K. I want to use CP2K to simulate the DFT of a polymer crystal, which contains ~2500 atoms (C, N, O, H). This initial crystal conformation was suggested by the experimenters, and I need to optimize this structure to find the minimal energy state.<br><br>I'm considering using CP2K due to its ability to do periodic DFT calculations. My question is related to what DFT functional and basis sets can be used to optimize a periodic crystal structure if such a massive system is considered? Maybe some there exists some examples of an input file for the problem of optimizing crystal systems using periodic boundary conditions?<br><br>For these calculations, I have a workstation with an AMD Ryzen 5950x and 64 GB of memory. Also, is it possible to speed up the calculation with the GPU?<br><br>Best wishes,<br><br>Victor<br></p></blockquote></div>
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