Depends, actually. There are reasons one might want to simulate a system at 380 K in NVT using the average box volume from the 300 K NPT simulation. Temperature replica exchange typically employs NVT and so might other temperature-based enhanced sampling approaches. Justin's right, you have to think it through, but I'm just chiming in to suggest that the answer is not obvious from this thread thus far. TIP3P water doesn't boil in NPT until somewhere around 550 K, so NPT at 380 K is certainly possible.
________________________________________ From: gromacs.org_gmx-users-boun...@maillist.sys.kth.se <gromacs.org_gmx-users-boun...@maillist.sys.kth.se> on behalf of Justin Lemkul <jalem...@vt.edu> Sent: 06 October 2016 09:34:49 To: gmx-us...@gromacs.org Subject: Re: [gmx-users] high-temperature MD On 10/6/16 8:54 AM, OuyangYanhua wrote: > Dear Justin, >> > I had run a 300K-MD, now I want to run a high-temperature(380K) MD to compare > with the 300K-MD. > The 300K is first equilibrated at NVT, then at NPT and production MD at NPT. > So I want to know the high-temperature(380K) MD should run the same as the > 300k, which means the 380k is also first equilibrated at NVT, then at NPT and > production MD at NPT ensemble. > Think scientifically. If you only want to vary the temperature, does it make any sense to vary the simulation protocol? -Justin > Best regards, > Ouyang > >> 在 2016年10月6日，下午7:22，Justin Lemkul <jalem...@vt.edu> 写道： >> >> >> >> On 10/6/16 3:52 AM, YanhuaOuyang wrote: >>> Hi, I want to perform a MD of an IDP, whose temperature is set to 380K. As >>> we >>> know, the MD is equilibrated firstly at NVT, then at NPT ensemble and >>> production MD at NPT ensemble normally. Does someone know whether the >>> 380K-MD >>> can only perform at NVT ensemble since the temperature(380K) is a high >>> temperature? Should I run the MD(380K) at NPT ensemble or at NPT ensemble? >>> >> >> 380 K is not very high. What you choose to do needs to be based on whatever >> real-world conditions you want to model. >> >> -Justin >> >> -- >> ================================================== >> >> Justin A. Lemkul, Ph.D. >> Ruth L. Kirschstein NRSA Postdoctoral Fellow >> >> Department of Pharmaceutical Sciences >> School of Pharmacy >> Health Sciences Facility II, Room 629 >> University of Maryland, Baltimore >> 20 Penn St. >> Baltimore, MD 21201 >> >> jalem...@outerbanks.umaryland.edu | (410) 706-7441 >> http://mackerell.umaryland.edu/~jalemkul >> >> ================================================== >> -- >> Gromacs Users mailing list >> >> * Please search the archive at >> http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! >> >> * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists >> >> * For (un)subscribe requests visit >> https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a >> mail to gmx-users-requ...@gromacs.org. > > -- ================================================== Justin A. Lemkul, Ph.D. Ruth L. Kirschstein NRSA Postdoctoral Fellow Department of Pharmaceutical Sciences School of Pharmacy Health Sciences Facility II, Room 629 University of Maryland, Baltimore 20 Penn St. Baltimore, MD 21201 jalem...@outerbanks.umaryland.edu | (410) 706-7441 http://mackerell.umaryland.edu/~jalemkul ================================================== -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org. -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.
