# Temperature not generated **URL:** \ **Category:** User discussions\ **Tags:** mdrun\ **Created:** [August 29, 2023, 5:06pm UTC](https://gromacs.bioexcel.eu/t/temperature-not-generated/7099 "2023-08-29T17:06:19Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jana](https://avatars.discourse-cdn.com/v4/letter/j/258eb7/32.png) [@jana](https://gromacs.bioexcel.eu/u/jana)\ **Post date:** [August 29, 2023, 5:06pm UTC](https://gromacs.bioexcel.eu/t/temperature-not-generated/7099/1 "2023-08-29T17:06:19Z")
GROMACS version: 2019 GROMACS modification: No Here post your question Dear all, I am interested to explore a short dynamics of a single atom/ion/radical. I tried to carried out NVT simulation of the monoatomic system at 300 K using V-rescale thermostat. But the temperature was not generated during this NVT step and the kinetic energy was zero. Consequently, no motion was observed. Could please suggest me what do I need to mention in the mdp file to generate the velocity or temperature? Best Regards, J ---
**Author:** ![jalemkul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/jalemkul/32/18_2.png) [@jalemkul](https://gromacs.bioexcel.eu/u/jalemkul)\ **Post date:** [August 30, 2023, 7:44pm UTC](https://gromacs.bioexcel.eu/t/temperature-not-generated/7099/2 "2023-08-30T19:44:22Z")
If you remove center-of-mass motion in a system of one atom, it won’t move. I suspect you’ve got `comm-mode` set to something other than `None`. ---
**Author:** ![jana](https://avatars.discourse-cdn.com/v4/letter/j/258eb7/32.png) [@jana](https://gromacs.bioexcel.eu/u/jana)\ **Post date:** [August 30, 2023, 8:31pm UTC](https://gromacs.bioexcel.eu/t/temperature-not-generated/7099/3 "2023-08-30T20:31:29Z")
Dear Professor Lemkul, Thank you for this nice suggestion. I did used “comm-mode = linear”. “comm-mode = none” is working perfectly. Sincerely, J