[gmx-users] How to define (or modify) a new potential function in Gromacs?

[lan hoa Trinh]

Dear Gromacs community,
I am attemping to use Gromacs for a Coarse - grained simulation. In our
model, we have a term similar to the angle harmonic potential term, but the
variable is not angle but the volume created by three consecutive vectors.
I don't know if there is a way to implement that kind of potential in
Gromacs?
I am looking forward to hearing from you.
Thank you very much in advanced,
Best regards,
*Lan Hoa*