# Running simulations with rvdw \> rcoulomb **URL:** \ **Category:** User discussions\ **Tags:** mdp-parameters\ **Created:** [February 27, 2021, 9:15pm UTC](https://gromacs.bioexcel.eu/t/running-simulations-with-rvdw-rcoulomb/1652 "2021-02-27T21:15:21Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![megamence](https://avatars.discourse-cdn.com/v4/letter/m/5e9695/32.png) [@megamence](https://gromacs.bioexcel.eu/u/megamence)\ **Post date:** [February 27, 2021, 9:15pm UTC](https://gromacs.bioexcel.eu/t/running-simulations-with-rvdw-rcoulomb/1652/1 "2021-02-27T21:15:21Z")
GROMACS version: 2020.5 GROMACS modification: Yes I am running a benzene simulation as outlined using opls-aa in this paper: [https://pubs.acs.org/doi/10.1021/ct2002122](https://pubs.acs.org/doi/10.1021/ct2002122) In this paper, they use rvdw=1.5 nm and rcoulomb=1.3nm. However, when I tried inputing those parameters in my GROMACS mdp file, I got the error: Verlet list does not support rvdw != rcouloumb. My question is, how do I run an atomistic simlations of this sort in GROMACS 2020.5, the way the authors of the paper have? ---
**Author:** ![alevilla](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/alevilla/32/439_2.png) [@alevilla](https://gromacs.bioexcel.eu/u/alevilla)\ **Post date:** [March 8, 2021, 4:08pm UTC](https://gromacs.bioexcel.eu/t/running-simulations-with-rvdw-rcoulomb/1652/2 "2021-03-08T16:08:32Z")
Hi, are the authors using PME? Then an alternative can be to use large rcoulomb (1.5). Increasing the rcoulomb in combination with PME does not affect too much the electrostatics Best regards Alessandra ---
**Author:** ![megamence](https://avatars.discourse-cdn.com/v4/letter/m/5e9695/32.png) [@megamence](https://gromacs.bioexcel.eu/u/megamence)\ **Post date:** [March 15, 2021, 2:52pm UTC](https://gromacs.bioexcel.eu/t/running-simulations-with-rvdw-rcoulomb/1652/3 "2021-03-15T14:52:15Z")
Thank you Alessandra. that has worked!