[gmx-users] Time step and constraints

[钩深致远]

Hi all,

  Recently, I run a peptide with about 110 atoms solvated in a cubic box
with about 1300 rigid TIP3P water molecules. A time step of 2 fs is used.
The constraints are turned off (constraints = none in mdp file). As I know,
a time step of 1 fs is usually used with no constraints. So my questions
are:

1.     When I run a peptide simulation, does it make sense if I use a time
step of 2 fs when the constraints are turned off?

2.     When the constraints are turned off, the rigid-bond of water
molecules are still maintained by the LINCS algorithm?

 Thanks in advance,
 Xiu Peng.
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