<span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">Dear cp2k users,</span><div><div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">I am running an NVT simulation for a biological system (~3500 atoms) at the BLYP-D3 level of theory using a Nosé–Hoover thermostat. The relevant section of my MD input is:</div><div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">"</div><div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"> &MD<br /> ENSEMBLE NVT<br /> STEPS 20000<br /> TIMESTEP 0.5<br /> TEMPERATURE 300.0<br /> COMVEL_TOL 1.0E-8<br /> &THERMOSTAT<br /> TYPE NOSE<br /> REGION MASSIVE<br /> &NOSE<br /> &END NOSE<br /> &END THERMOSTAT<br /> &END MD<br /></div><div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;">"</div><div style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small;"><p>During the simulation, I observed that the instantaneous temperature oscillates between ~280 K and ~330 K (see attached figure). Could someone please clarify whether this behavior indicates that the system has not yet reached equilibrium, or if it is primarily related to the thermostat settings?</p><p>Any guidance or suggestions would be greatly appreciated.</p><p>Thank you for your time and consideration.</p><p>Best regards,</p><p>Subho</p></div></div>
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