# Pressurized fluid flow **URL:** https://gromacs.bioexcel.eu/t/pressurized-fluid-flow/2974 **Category:** User discussions **Created:** [October 17, 2021, 11:57pm UTC](https://gromacs.bioexcel.eu/t/pressurized-fluid-flow/2974 "2021-10-17T23:57:11Z") **Posts on this page:** 1 **Showing post:** 7
### Author: ![MichelePellegrino](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/michelepellegrino/32/628_2.png) [@MichelePellegrino](https://gromacs.bioexcel.eu/u/MichelePellegrino) #### Post date: [October 19, 2021, 6:52am UTC](https://gromacs.bioexcel.eu/t/pressurized-fluid-flow/2974/7 "2021-10-19T06:52:00Z")
This could be the reason for it being deprecated: > [@Constant-acceleration MD (anti-bug)](https://gromacs.bioexcel.eu/t/constant-acceleration-md-anti-bug/1614): > > GROMACS version: 2019 and 2021 GROMACS modification: No I am using acceleration groups in GROMACS extensively. (keywords: “acc-grps”, “accelerate”) I was slightly surprised to read that “constant-acceleration MD” would be removed in GROMACS 2021 and that it has been broken for a long time, as my results seemed to make sense. Perhaps this is not exactly the same functionality as I have been using? At any rate, I ran some trial runs where I had a water box with 1 Na+ and 1 Cl- ion, and I’d app… --- _[View the full topic](https://gromacs.bioexcel.eu/t/pressurized-fluid-flow/2974)._