Hi Onofrio<div><br></div><div>Question: have you set this up and run a more standard simulation to work out the convergence first?</div><div><br></div><div>If I guess, it's probably Cu as a transition metal with d-orbitals that is difficult (I am suffering with Au).<br><br></div><div><div>Kind Regards</div><div><br></div><div>Sam </div></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Wednesday, June 15, 2022 at 3:20:20 PM UTC+2 onofr...@gmail.com wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Dear CP2K community,<br><br>I'm new to CP2K and I'm trying to set up a second-generation Car-Parrinello (SGCP) MD simulation. I have started with a geometrically optimized system of toluene adsorbed on a 3-layer Cu slab (8x6). I would to know what sections/keywords in the input file must be used to correctly set up a SGCPMD simulation and, possibly, the best settings to improve the speed of such simulations since I have not found any related tutorial (but only few things in the cp2k google group). <br>If I well understood, it has to be turn on the Langevin dynamics section in combination with the OT method. For example:<br><br>&FORCE_EVAL<br> ...<br> &DFT<br> ...<br> &QS<br> METHOD GPW<br> EXTRAPOLATION ASPC<br> EXTRAPOLATION_ORDER 3<br> EPS_DEFAULT 1.0E-10<br> &END QS<br> ...<br> &SCF<br> ...<br> &OT<br> PRECONDITIONER FULL_SINGLE_INVERSE ! or FULL_KINETIC<br> MINIMIZER DIIS<br> N_DIIS 7<br> &END OT<br> &OUTER_SCF<br> MAX_SCF 3<br> EPS_SCF 1.0E-05<br> &END OUTER_SCF <br> ...<br> &END SCF<br> ...<br> &END DFT<br> ...<br>&END FORCE_EVAL<br><br>&MOTION<br> &MD<br> ENSEMBLE LANGEVIN<br> ...<br> &LANGEVIN<br> GAMMA 0.001<br> &END LANGEVIN<br> ...<br> &END MD<br> ...<br>&END MOTION<br><br>Is it correct? To follow what I just mentioned, I prepared an input file (attached below) based on sections/keywords defined just above and I got from the output file (attached below) only <br> <b><i>"Leaving inner SCF loop after reaching 200 steps" </i></b><div>(200 steps because I set MAX_SCF 200)<br>resulting in a very bad convergence. <br>As a result, it seems that I have not been running any SGCPMD simulation but a simple bad BOMD. Am I missing something?<br>How can I correctly set up my input file for SGCPMD?<br><br>Any help would be greatly appreciated.</div><div>Thanks.<br><br>Onofrio<br></div></blockquote></div>
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