To whom it may concern:
I'm trying to cool my system down using Langevin method. In the document, I found
fix ID group-ID langevin Tstart Tstop damp seed keyword values
damp = damping parameter (time units)
The damp parameter is specified in time units and determines how rapidly the temperature is relaxed. For example, a value of 100.0 means to relax the temperature in a timespan of (roughly) 100 time units (tau or fmsec or psec - see the units command).
I tried to set damp = 1. with units metal
I was expecting to see the temperature goes down to Tstop in around 1ps. But it shows after 20ps, the temperature is still far away from Tstop.
How can I control the time span of the procesure precisely?