# How to fix center of mass of group of molecules?

**URL:** <https://gromacs.bioexcel.eu/t/how-to-fix-center-of-mass-of-group-of-molecules/3676>\
**Category:** User discussions\
**Tags:** forcefield, mdp-parameters\
**Created:** [February 16, 2022, 6:34am UTC](https://gromacs.bioexcel.eu/t/how-to-fix-center-of-mass-of-group-of-molecules/3676 "2022-02-16T06:34:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sana](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/sana/32/1217_2.png) [@sana](https://gromacs.bioexcel.eu/u/sana)\
**Post date:** [February 16, 2022, 6:34am UTC](https://gromacs.bioexcel.eu/t/how-to-fix-center-of-mass-of-group-of-molecules/3676/1 "2022-02-16T06:34:18Z")

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GROMACS version: 2020.1-Ubuntu-2020.1-1  
GROMACS modification: Yes/No  
Here post your question : How to fix center of mass of group of molecules?