Re: [gmx-users] Pressure coupling in expanded ensemble simulations

2019-05-20 Thread Gregory Man Kai Poon
Hi Michael, Our system of interest here is a set of small proteins with disordered regions. The literature suggests that RE methods are not well-suited to sampling such systems with dynamically "hot/cold" regions (and requiring more specialized techniques such as the link below) on the one

Re: [gmx-users] Pressure coupling in expanded ensemble simulations

2019-05-19 Thread Michael Shirts
Ah, sorry, I thought there was more information coming. Have you considered just using temperature replica exchange? It's not that much less efficient, and is easier to deal with. Replica exchange should be working with NPT (as long as you use Parrinello-Rahman and a reasonable temperature

Re: [gmx-users] Pressure coupling in expanded ensemble simulations

2019-05-17 Thread Gregory Man Kai Poon
Hi Michael, I am just following up on your thoughts on how carrying out expanded ensemble at NVT and converting back to NPT on the mailing list. Again I appreciate your advice in this area. Best wishes, Gregory On 5/8/2019 12:01 PM, Michael Shirts wrote: Yeah, this is an unfortunately

Re: [gmx-users] Pressure coupling in expanded ensemble simulations

2019-05-08 Thread Michael Shirts
Yeah, this is an unfortunately place in the code where not all combinations work - very long story. Hopefully this will be working better in 2020. What I would recommend is, if possible, performing the expanded ensemble simulation at NVT. Everything should work fine there (paper coming out

[gmx-users] Pressure coupling in expanded ensemble simulations

2019-05-08 Thread Gregory Man Kai Poon
Hi all: We are interested to do expanded ensemble simulations (such as simulated tempering) on GROMACS.  Extensive fiddling with the settings and googling on other people's experience suggests that these simulations must use the md-vv integrator, which in turn is compatible with Berendsen or