[gmx-users] Long range dispersion correction

[david.evans at ulsop.ac.uk]

Dear Gromacs users,

I'm simulating a system with explicit water and periodic boundary
conditions.
I have rlist = rvdw = 1.2 in this case.

When I add the line
dispcorr            = enerpres
to my .mdp file, I get output
        LJ (SR)  Disper. corr.   Coulomb (SR)   Coulomb (LR)     
Potential
    1.56851e+04    0.00000e+00   -1.37844e+05   -1.41460e+04  
-1.47582e+05

i.e. the dispersion correction is zero, but the program has
recognised that I want to calculate it.
What could cause this number to be zero?

Thanks

Dave Evans
London School of Pharmacy