Constant force by table potential

GROMACS version: 2021
GROMACS modification: No
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I want to add a constant force along the direction of the position unit vector for each particle. How can I do that? Please help me

What do you mean with position unit vector?

Acceleration groups can be used to add a force to particles in a given direction.

Let’s say I have a polymer chain I want to add a constant force tangentially along all bonds.

I don’t understand why that would be useful.