[CP2K:5272] Stress Tensor forcing SCF Wavefunction Optimization
Rafael Soler-Crespo
rasole... at gmail.com
Tue May 13 14:19:58 UTC 2014
Hi Juerg,
You are correct. However, I am not using MD on this run. In the one I
posted, I am trying to perform a cell optimization. I didn't take off the
keywords for the MD printing of stress but those are never printed (as I
have no MD steps). What I don't understand is why I can get a stress tensor
using the numerical evaluation of the stress tensor but when I use the
analytic formulation of the stress tensor, the code always crashes after
the initial SCF wavefunction optimization. Do you have any ideas what might
be going on to prevent the analytical formulation from processing
correctly? I checked line 271 of the referenced code:
cppostcondition(.NOT.use_virial,cp_failure_level,routinep,error<http://cp2k.web.psi.ch/doxygen/trunk/df/dcd/sockets_8c.html#a4866b2d37ffc80c5ba705d3fcd1e0ecf>
,failure)
And I take it to mean that the function will not work if I am using a
virial formulation of the stress tensor (and thus forcing me to always use
the numerical evaluation). Does this seem correct to you? I would prefer to
use the virial formulation of the stress tensor but since the simulation
isn't converging I have little choice as it is. Furthermore, this check is
within an do_ewald loop (and I don't even have Ewald enabled for this
calculation).
Is it something related to DFTB not being able to use analytical
formulations of the stress tensor?
Thanks,
Rafael
And i
On Tuesday, May 13, 2014 2:12:18 AM UTC-5, jgh wrote:
>
> Hi
>
> I don't know why your SCF didn't converge, but you will get
> different stress tensors for MD and simple single point calculations,
> as in the former you have a contribution from the atomic velocities.
>
> regards
>
> Juerg
> --------------------------------------------------------------
> Juerg Hutter Phone : ++41 44 635 4491
> Institut für Chemie FAX : ++41 44 635 6838
> Universität Zürich E-mail: hut... at chem.uzh.ch
> Winterthurerstrasse 190
> CH-8057 Zürich, Switzerland
> ---------------------------------------------------------------
>
> -----cp... at googlegroups.com wrote: -----
> To: cp... at googlegroups.com
> From: Rafael Soler-Crespo
> Sent by: cp... at googlegroups.com
> Date: 05/13/2014 01:27AM
> Subject: Re: [CP2K:5272] Stress Tensor forcing SCF Wavefunction
> Optimization
>
> Hi Juerg,
>
> Thanks for your reply. Apparently, this got lost somewhere in space, so I
> just saw it. I attach my full input at the end of my post.
>
> The system is a sheet of oxidized graphite oxide and I am trying to get an
> idea of the stress tensor during cell optimization. Based on your post,
> yes, you are right -- the multiple SCF wavefunction optimizations are just
> the finite differences to find the stress tensor. I tried using the
> diagonal analytical keyword but it wouldn't work for some reason. The error
> was:
>
> *** SCF run NOT converged ***
>
>
> Core Hamiltonian energy:
> -514.15564300498284
> Repulsive potential energy:
> 15.42812723286143
> Electronic energy:
> 0.81658900421239
> Dispersion energy:
> 0.00000000000000
>
> Total energy:
> -497.91092676790907
>
> ***************************************************************************
>
> *** 18:26:20 ERRORL2 in qs_dftb_coulomb:build_dftb_coulomb processor 0
> ***
> *** :: err=-300 condition FAILED at line 271
> ***
> ***************************************************************************
>
>
> I am unsure why (and trying both on a locally compiled copy and also on a
> cluster copy didn't work) I got this error. I will also look into using
> Ewald summations as, yes, my system is both periodic and I am using DFTB. I
> forgot I turned it off to test some input a long time ago and never
> returned it to on!
>
> Now I am finding that if I take a snapshot (same atomic coordinates) of
> the system and recalculate the stress doing a single point (ENERGY_FORCES)
> calculation it doesn't give me the same stress values. This is probably
> because the wavefunction is not the same during the cell optimization.
> Would you agree with my conclusion, and do you have any hints or tips for
> obtaining accurate results of the stress tensor in CP2K calculations for
> systems like mine?
>
> Thanks a million for your response and help in advance!
> Rafael
> ===================================
> INPUT
>
> &FORCE_EVAL
> STRESS_TENSOR DIAGONAL_NUMERICAL
> &DFT
> &QS
> METHOD DFTB
> &DFTB
> SELF_CONSISTENT T
> DO_EWALD F
> DISPERSION F
> &PARAMETER
> PARAM_FILE_PATH /home/ras536/dftb_parameter_sets/cp2k/scc/
> PARAM_FILE_NAME parameter_table
> UFF_FORCE_FIELD uff_table
> &END PARAMETER
> &END DFTB
> &END QS
> &SCF
> SCF_GUESS ATOMIC
> MAX_SCF 200
> &OT ON
> LINESEARCH 3PNT
> PRECONDITIONER FULL_SINGLE
> &END OT
> &END SCF
> &END DFT
> &SUBSYS
> &CELL
> # Change with the system coordinates
> ABC 21.30 22.14 100
> ALPHA_BETA_GAMMA 90 90 90
> PERIODIC XYZ
> SYMMETRY ORTHORHOMBIC
> # End of changes
> &END CELL
> &COORD
> # Paste here system coordinates
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> # End of system coordinates
> &END COORD
> &END SUBSYS
> &PRINT
> &STRESS_TENSOR
> FILENAME __STD_OUT__
> LOG_PRINT_KEY TRUE
> ADD_LAST NUMERIC
> &EACH
> CELL_OPT 1
> &END EACH
> &END STRESS_TENSOR
> &END PRINT
> &END FORCE_EVAL
> &GLOBAL
> PROJECT geo_opt_go_patch
> RUN_TYPE CELL_OPT
> PRINT_LEVEL LOW
> &END GLOBAL
> &MOTION
> &CELL_OPT
> EXTERNAL_PRESSURE 0 0 0 0 0 0 0 0 0
> KEEP_ANGLES TRUE
> KEEP_SYMMETRY TRUE
> MAX_ITER 1000
> &END CELL_OPT
> # Uncomment to allow printing of stress tensor.
> # Also need to uncomment the stress tensor evaluation.
> &PRINT
> &STRESS
> &END STRESS
> &END PRINT
> # End of uncomment
> &END MOTION
> ==================================
>
>
>
> On Saturday, May 3, 2014 9:33:44 AM UTC-5, jgh wrote:Hi
>
> I cannot see any problematic behavior when running a similar
> system (you don't give us your exact input).
> Could it be that the additional SCF iterations you see, are just the
> finite difference calculations from the numerical stress evaluation?
> BTW why not using the analytic stress evaluation?
> Also, if you are using DFTB and periodic boundary conditions I would
> strongly advice to use EWALD!
>
> regards
>
> Juerg
>
> --------------------------------------------------------------
> Juerg Hutter Phone : ++41 44 635 4491
> Institut für Chemie FAX : ++41 44 635 6838
> Universität Zürich E-mail: hut... at chem.uzh.ch
> Winterthurerstrasse 190
> CH-8057 Zürich, Switzerland
> ---------------------------------------------------------------
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