[gmx-users] Is there still interest in rigid-body simulation?

[Luca Bellucci]

Hi Adam,
because some time ago I was involved in a rigid-body MD project, I am 
interested to known if you are  following a published or known method.
I do not  know your rigid-body algorithm, however I would suggest you to  take 
care on rotations,  because they are not a simple task. 
Good luck
Luca

> Hi all,
> I have seen a few posts on gmx-users indicating a desire to treat certain
> atom groups as rigid bodies in MD simulations.  I just started implementing
> this, and so far I have it working for translational forces (not rotation,
> though this should be simple to add), even when the group is split over
> multiple processors.  At the moment I have the rigid body groups specified
> as freeze groups in the mdp file, but there could be a separate option.
>  Would anyone else find this useful?  The problem is that: (a) I am
> modifying GROMACS 4.5.1, so I am some months out of date, and (b) my code
> is probably not to spec.  If it is worthwhile, I can restart from 4.5.4
> (the code modifications are quite small) and make an effort to conform to
> coding standard.  Best,
>
> Adam Herbst