[gmx-users] Hard Sphere?

[nishap.patel at utoronto.ca]

Hello,

    I am not sure if anyone else has some experience with this, but I  
want to simulate a hard sphere in a solvent (water and heptane). I  
believe for the hard spheres, the attractive terms for LJ potential is  
very negligible so the only term to take into account is repulsion,  
from what I understand. Is there a way I can define hard sphere in  
gromacs?

I would really appreciate some kind of direction.

Thanks.

-Nisha P