Hello all, Now I want to have a simulation of water and methane system, but when I wrote a methane.itp and the force field file, it could not run correctly. I used tip4p water and the opls-aa methane. According to the simulation with NPT, not only the pure methane system, but also the water and methane system, the simulated box became larger and lager, I don't know why and I cann't find the problem, could you tell me what's the problem? looking forward to your reply and thanks a lot. Liu Chanjuan Institute of Geology and Geophysics, Chinese Academy of Sciences TEL:010-82998424 E-mail:[email protected] -- gmx-users mailing list [email protected] http://lists.gromacs.org/mailman/listinfo/gmx-users * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting! * Please don't post (un)subscribe requests to the list. Use the www interface or send it to [email protected]. * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists

